Emotion classification for musical data using deep learning techniques

International Journal of Reconfigurable and Embedded Systems (IJRES)
Vol. 12, No. 2, July 2023, pp. 240~247
ISSN: 2089-4864, DOI: 10.11591/ijres.v12.i2.pp240-247  240
Journal homepage: http://ijres.iaescore.com
Emotion classification for musical data using deep learning
techniques
Gaurav Agarwal1
, Sachi Gupta2
, Shivani Agarwal3
, Atul Kumar Rai4
1
Department of Computer Science and Engineering, KIET Group of Institutions, Ghaziabad, India
2
Department of Information Technology, IMS Engineering College, Ghaziabad, India
3
Department of Information Technology, Ajay Kumar Garg Engineering College, Ghaziabad, India
4
Department of Computer Science and Engineering, Kothiwal Institute of Technology and Professional Studies, Moradabad, India
Article Info ABSTRACT
Article history:
Received Oct 8, 2022
Revised Dec 10, 2022
Accepted Feb 18, 2023
This research is done based on the identification and thorough analyzing
musical data that is extracted by the various method. This extracted
information can be utilized in the deep learning algorithm to identify the
emotion, based on the hidden features of the dataset. Deep learning-based
convolutional neural network (CNN) and long short-term memory-gated
recurrent unit (LSTM-GRU) models were developed to predict the
information from the musical information. The musical dataset is extracted
using the fast Fourier transform (FFT) models. The three deep learning
models were developed in this work the first model was based on the
information of extracted information such as zero-crossing rate, and spectral
roll-off. Another model was developed on the information of Mel frequency-
based cepstral coefficient (MFCC) features, the deep and wide CNN
algorithm with LSTM-GRU bidirectional model was developed. The third
model was developed on the extracted information from Mel-spectrographs
and untied these graphs based on two-dimensional (2D) data information to
the 2D CNN model alongside LSTM models. Proposed model performance
on the information from Mel-spectrographs is compared on the F1 score,
precision, and classification report of the models. Which shows better
accuracy with improved F1 and recall values as compared with existing
approaches.
Keywords:
Deep belief network
Deep convolutional neural
network
Deep neural networks
Fast Fourier transform
Long short-term memory
This is an open access article under the CC BY-SA license.
Corresponding Author:
Gaurav Agarwal
Department of Computer Science and Engineering, KIET Group of Institutions
Ghaziabad, Uttar pradesh, India
Email: gaurav13shaurya@gmail.com
1. INTRODUCTION
In human-to-human communication, emotion plays a significant role because human contact does
not include only language but contains non-verbal clues like gestures of the body, tones of voice, hand
gestures, and facial expressions [1]-[3]. Thus, in various fields, such as applications in a call center,
psychology, and text-to-speech engines, emotion recognition has been an essential inter-disciplinary research
topic. Nowadays, emotion in music, audio, or lyrics plays a vital role in day-to-day human life and even more
so in the digital age. There is a strong relation between music and emotion. Over the last quarter-century,
many researchers recognized and classified emotion in music [4], [5]. In music information retrieval (MIR),
automatic emotion recognition from music is an active task. There are many applications for music emotion
reorganization in the field of music information retrievals, such as classification of the music emotion, music
generation, instrument recognition, music source separation, and music recommender system. Consequently,

Int J Reconfigurable & Embedded Syst ISSN: 2089-4864 
Emotion classification for musical data using deep learning techniques (Gaurav Agarwal)
241
emotion-based MIR attracted attraction in fields such as academia and the industry. In the academic emotion
analysis of music, signals involve mood track, music sense, mood cloud, and moody. On the other side, from
the field of industry, MIR also received attraction because many music companies use emotion as a cue for
MIR, which are stated as grace notes, mood logics, mouseovers, and syntonic industries [6], [7].
Determination of the emotional category of music from audio or lyrics is quite challenging due to emotion
labeling of music excerpts, feature extraction from the audio signals, and choosing the classification
algorithm in the music emotion recognizing (MER) system. A music information retrieval subpart represents
a MER system. The MER system has multiple application regions in emotion recognition, for example,
suggestion systems for music, the creation of music playlists automatically, and music therapy. Music
emotion recognizing systems build up with the music databases. There are two types of approaches in the
MER system for databases: categorial and dimensional. The dimensional approach contains two-dimension
valence and arousal. On the other side, emotions for the categorical approach are characterized as sad, happy,
angry, and fearful [8]-[11]. There is the main aim of the music emotion reorganization system is to define the
appropriate content of music by using deep learning or machine learning algorithm for classifying the
emotion from music signals and signal processing techniques such as discrete Fourier transform and fast
Fourier transform, respectively, for converting windowing frame into magnitude spectrum. For effective
emotional recognition in music most widely utilized, energy-based features are perceptual based linear
prediction cestrum coefficients (PLPCC), Mel frequency-based cepstral coefficient (MFCC), Mel energy-
based cestrum dynamic coefficients (MEDC), and linear predictor coefficients (LPC) respectively [12].
Further, the emotion recognition for lyrics feature is based on natural language processing. Natural language
processing uses various text classification methods for feature extraction from text data. The final stage of
emotion recognition from audio or lyrics is the classification stage classification, and the most recent work
addresses emotion classification by machine learning or deep learning. Deep learning algorithm-based
models are stated as the deep belief network (DBN), deep convolutional neural network (DCNN) [13]-[15],
deep neural networks (CNN or DNN), long short-term memory (LSTM), and on another side machine
learning algorithm-based model is Naive bayes classifier, Gaussian mixture model (GMM), random forest
algorithm (RF), K-nearest neighbor (KNN), support vector machine (SVM) are used as a classification model
for music emotion recognition [16], [17]. Also, the emotion classification from the music has been done
using a combination of various models represented as a multi-modal such as bidirectional encoder
representations from transformers (BERT) and LSTM, CNN and LSTM, and CNN and Bi-LSTM. Using the
multi-modal emotion classification model improves model accuracy for the emotion classification in both
audio and lyrics [18]-[20].
Music emotion detection is a challenging task because emotions are subjective [21]. So, an
optimized approach is required to improve the music emotion recognition accuracy. The major contribution
of the presented methodology is to recognize the emotions of music with enhanced accuracy. The recognition
accuracy generally depends on the effective feature extraction as well as on the selection of the features.
Therefore, the proposed methodology uses the innovative pre-processing approach and also develops a
hybrid form of classifier for emotions classification. Motivation, by summarizing music emotion classification
(MEC), getting an idea that MEC is the essential technique for dealing with huge amounts of information about
music. Using a traditional algorithm-based method for music emotion classiﬁcation has a disadvantage because
it is time consuming for music emotion recognition and has low accuracy; thus, single-model analysis can’t
fully express music emotion, so utilizing the multi-model analysis for the music emotion recognition from the
audio signal [22]-[24]. Therefore, fast learning speed and high classiﬁcation accuracy are achieved with music
emotion classification by using a multi-modal fusion model research analysis based on audio cues. The
performance measurement of multimodal fusion model analysis and dynamic classification performance could
be improved by using a fusion of emotional information in music audio. Thus, in this research work for music
emotion classification deep learning algorithm-based convolutional neural network (CNN) and ensemble of the
LSTM-GRU model was utilized. Where the feature extraction process is done by the CNN and the emotion
classification process is done by the ensemble LSTM-GRU model.
2. RESEARCH METHOD
2.1. Data collection
For this research work, we used the music emotion classes dataset and the dataset available on Kaggle
open source data. Using this music emotion classes dataset performing music emotion classification for
different emotions. The dataset consists of 10,133 data samples, which contain 5 different emotions from music
signals namely, happy, sad, romantic, dramatic, and aggressive. A dataset consisting of various audio features
and MFCC features for musical clips. Also, in the dataset MFCC feature consisting 20 MFCC coefficients.

 ISSN: 2089-4864
Int J Reconfigurable & Embedded Syst, Vol. 12, No. 2, July 2023: 240-247
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2.2. Data visualization
We analyze five different emotions happy, aggressive, sad, romantic, and dramatic in a percentage
of the music emotion classes. Dramatic and happy emotions get higher percentages such as 23.5% and 22.2%
respectively compared to the other three emotions from the audio and MFCC features. After analyzing a
correlation between the audio feature, plotting to scatter plot between the 1. Spectral bandwidth and zero-
crossing rate 2. Chroma short-time Fourier transform (STFT) and spectral roll-off for the five types of
emotion. Based on the above clustering figures of the cluster of different audio emotion categories based on
the various features and all these characteristics are further utilized in the deep learning model for the
different emotion pattern recognition based on various features.
2.3. Proposed methodology
A CNN is based on a deep learning algorithm technique. CNN is solely based on the SoftMax unit
for classification purposes. CNN is commonly used to analyze visual images like facial recognition, pattern
recognition, image processing, and object detection which provides a better classification of data. The CNN
is a systematic neural network structure with multiple layers. A CNN consists of three layers, stated as a: i)
convolution layers, ii) pooling layers, and iii) a fully connected layer and a SoftMax unit consist of two-
dimensional planes. CNN builds the input by extracting feature pipeline modeling as an abstract. In CNN,
one or more convolutional layers are utilized. The convolution layer produces a feature map consisting of the
number of filters. During the convolution process, each local feature is first calculated using a convolutional
kernel and the convolution kernel consists of height and bias. Each local component of the input vector
convolved with the filter, which is the base of regional connections. A single convolution kernel represents
the weight and height 𝑊 and 𝐹 respectively, input vector and bias represent with 𝑋𝑖 and 𝑁𝑖 respectively.
After that, obtaining the output of the convolution layers by applying an activation function rectified linear
unit (ReLU) or a non-linear methodology. Finally using the ReLU activation function or non-linear
methodology computing the final convolution feature. The output of the convolutional layer passes to the
pooling layers. After the convolution layer 𝑟𝑖 process, the pooling layer’s aim is to reduce pattern resolut ion
numbers and reduce the computational load by taking the mean values of each and every subsection of the
n*n matrix. During the pooling layer process, the expanse of all the feature maps is done by the max-pooling
operation using filter size. Like any other neural network, in the input layer the fully connected layers, hidden
layer, and output layer must be fully connected layers. The resulting outcome of the pooling layer process is
passed to a fully connected layer and classified by the soft max unit when the flattened layer transforms the
feature into a feature vector.
2.4. CNN and LSTM model layers and configurations
2.4.1. A deep learning model was developed based on the audio features dataset
For this model the following 6 features of the extracted musical data are utilized to train the model.
The music attributes are generally organized into a four-eight number of diverse classifications and each
category specifies various concepts. The names of the categories include dynamics, tone color-timbre,
rhythm, harmony, musical form, melody, musical texture, and expressive techniques.
- Chroma STFT
- RMSE
- Spectral centroid of the music
- Spectral bandwidth of the music
- Roll-off features
- Zero crossing rate of the music
Based on this information audio files features were trained with the CNN and LSTM Bi-direction
models with the categorical cross-entropy of loss functions. Table 1 consisting the information about the CNN-
LSTM model parameters for the various audio features. For this model the first embedded layers were utilized
to combine the two deep learning models CNN with the LSTM Bi-directional model. the initial vector of the
emending vector is 32. The sequential models of 64 filters, 5*5 kernel size, an activation function is ReLU with
the 1-D convolution layers. Further, the layer and information are max pooling and reducing the filter size by
4*4 filters and flattening the model information by the bi-directional LSTM model which is configured by 400
gated recurrent unit (GRU) perceptron of the LSTM model. After this embedding the CNN and LSTM models.
Figure 1 shows the training and validation accuracy and loss of the first model trained with various music
extracted features.

243
Table 1. CNN-Bi-LSTM model for the MFCC features
Layer (type) Output Shape Param
Embedding layer (Embedding) (None, 20, 32) 16,000
Conv1d_1 (Conv1D) (None, 20, 64) 10,304
Max_polling1d (Max Polling 1D) (None, 5,64) 0
LSTM (LSTM) (None, 300) 438,000
Dense 1 (Dense) (None, 256) 77,056
Dense_2 (Dense) (None, 128) 32,896
Dense_3(Dense) (None, 64) 8,256
Dense_4 (Dense) (None, 5) 325
Total params: 582,837
Trainable params: 582,837
Non-trainable params: 0
Figure 1. Training accuracy and loss of the first model trained with various music extracted features
2.4.2. Deep CNN and LSTM model
Deep CNN and LSTM model for the MFCC channel dataset are utilized with the 20 MFCC
channels, all these features are thoroughly analyzed by statical analysis, and based on this information the
deep learning hybrid model was developed. From Figure 2 training-validation accuracy and loss of the model
trained with the MFCC features can be depicted. Table 2 shows the CNN-Bi-LSTM model parameter for the
MFCC feature. This developed model is configured very similarly to table 1 but the configuration of the deep
learning models and the embedding layer of the model were reconfigured based on the dataset information.
The model is reconfigured with the 32 filters with the exponential increase in the filter size with the max
pooling layer of the configuration of 64 filters for the extraction of the dataset. The dataset consists of 20
features which are more than the first model so the filers are able to extract a greater number of features with
the embedding Bi-directional LSTM model the model configuration is displayed in Table 1.
Figure 2. Training-validation accuracy and loss of the model trained with the MFCC features

 ISSN: 2089-4864
244
Table 2. First model classification report (performance analysis)
Class Precision Recall F1-score Support
0 0.44 0.32 0.37 487
1 0.42 0.27 0.33 578
2 0.32 0.68 0.45 576
3 0.37 0.24 0.29 408
4 0.85 0.61 0.71 485
Accuracy 0.73 2534
Micro Avg 0.75 0.73 0.73 2534
Weighted Avg 0.75 0.73 0.73 2534
Dataset used: international society for music information retrieval 2012 dataset (ISMIR2012) [25].
The ISMIR2012 is a popular music dataset used for emotion recognition that consists of various types of
songs in two languages, English and Hindi. The total numbers of songs in the English language are 2886 in
which sad songs are 759, 746 are happy songs, 636 are angry songs, and relaxing songs are 745. Similarly,
the total number of songs in the Hindi language is 1037 in which 200 songs are happy, 216 songs are sad
songs, 283 songs are angry and 338 songs are relaxing. The collection of emotional songs is used for the
categorization of different emotions.
3. RESULTS AND DISCUSSION
As shown in the Figure 1 model 1 were developed based on the musical features which are able to
achieve training accuracy up to only 40% and features get stuck into the local minimum condition of the
model in which the training parameters and the weights of the model get saturated due to sometimes fewer
numbers of epochs or due to fewer features of the training parameters which is why this model gets stuck at
40% of accuracy and loss is get saturated so based on this parameter the model cannot be trained or tuned for
the prediction and analysis of the emotion detection from the musical information.
The second model were developed based on the information and the data of musical information
extraction based on the MFCC 20 channel features. These 20 features of the music are able to extract a
greater number of hidden features from the models however the extracted information from the model.
however, this model is developed with 200 epochs but when the training cross 100 epochs the model is going
to get saturated with the 72% of model accuracy and stuck with the limited information about the musical
features, so based on these two conditions of the model 1 and the model 2 it is very clear that for the
indentation of the emotion from the music more numbers of hidden features needed to be extracted so for that
purpose the Mel-spectrographs is utilized in the third model. Classification report of model trained with
MFCC information can be analyzed in Table 3.
Table 3. Classification report of model trained with MFCC information
0 0.62 0.74 0.67 487
1 0.68 0.83 0.75 578
2 0.88 0.67 0.76 576
3 0.71 0.80 0.76 408
4 0.85 0.61 0.71 485
Accuracy 0.73 2534
Micro Avg 0.75 0.73 0.73 2534
Weighted Avg 0.75 0.73 0.73 2534
In the third model the Mel-spectrographs of the music is utilize to train the model based on the
outcome of the first two models. Training accuracy and loss of the third model with the Mel-spectrographs of
the musical information can be depicted from Figure 3. This third model is trained with the 210 epochs which
are able to generate 94% accuracy during the model training and during the model validation and testing the
average and weighted accuracy is around 95% which can be analyzed in Table 4. These Mel-spectrographs
are 2D type datasets so for this purpose the 2D CNN model has utilized this model extract a greater number
of hidden features by applying multiple filters to the dataset which is not possible for the 1D data utilized in
the above two models which is why this model is able to generate better prediction accuracy than the other
two models.

245
Figure 3. Training accuracy and loss of the model with the Mel-spectrographs of the musical information
Table 4. Model performance on the information from Mel-spectrographs
0 1.00 1.00 1.00 620
1 0.90 1.00 0.95 735
2 0.92 1.00 0.96 633
3 1.00 0.88 0.94 493
4 1.00 0.85 0.92 559
Accuracy 0.95 3040
Micro Avg 0.96 0.95 0.95 3040
Weighted Avg 0.96 0.95 0.95 3040
4. CONCLUSION
With the development of the deep learning algorithm-based technique and digital technology for
audio, the musical emotion recognition (MER) system has gradually emerged as the research hotspot. At
present, for the MEC problem deep learning techniques are gradually mainstream. The focus of the music
emotion classification research is to design a proficient and robust model for the recognition of emotion. So,
this research work provided a detailed review of deep learning-based architecture and acoustic features for
the music emotion classification. The proposed method is evaluated on the music emotion classes datasets.
These deep learning algorithm-based models and their layer-wise architectures are explained in detail based
on the classification of various emotions as dramatic, happy, aggressive, sad, and romantic. Therefore,
proposing a CNN and an ensemble of LSTM-GRU method for a music emotion classification. First audio and
spectrogram feature extracted from music signal. Here we examined various feature extraction techniques
based on audio features and spectrograph features. After that create additional training samples from
spectrogram images through the data augmentation process. Here, the CNN performs feature extraction from
the spectrogram images. Here we performed a deep learning algorithm-based model for both audio and
spectrograph features and from this analysis, the deep learning-based model for spectrograph feature obtained
higher accuracy than the audio feature.
ACKNOWLEDGEMENTS
Author thanks their organization for providing full support in the completion of this manuscript as
well as all the other authors whose manuscript has been reviewed and considered for this manuscript.
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BIOGRAPHIES OF AUTHORS
Gaurav Agarwal is an Assistant Professor, KIET Group of Institutions,
Ghaziabad, has more than 19 years of teaching and research experience. He received his Ph.D.
in Computer science of Engineering in 2022 from Indian institute of technology, Dhanbad.
M.Tech. degree in Computer engineering from Shobhit University, Meerut, India, in 2010 and
B.E. degree in Computer engineering from the North Maharastra University, Jalgaon,
Maharastra, India, in 2003. He had also worked as Senior faculty research fellow at IIT Delhi
in 2015. He has contributed more than thirty-five research papers in several International and
National journals and conference proceedings of high repute. His main areas of research
interest are speech signal processing, genetic algorithms and web search engines. He has also
filled 4 Indian patents out of which 2 are granted. He is reviewer of more than 10 SCI Journals.
He can be contacted at email: gaurav13shaurya@gmail.com.

247
Dr. Sachi Gupta is a Professor and Head of the IT Department at IMS
Engineering College, Ghaziabad, has more than 18 years of teaching and research experience.
She completed her Ph.D. and M.Tech. (gold medalist) degrees from Banasthali Vidyapith,
Rajasthan in the Computer Science domain. She completed her B. Tech from UPTU,
Lucknow. She has filed six patents, out of which three have been granted, and published more
than twenty papers in national/international level conferences/journals of repute. She is an
active member of CSI, Vibha, IACSIT, and IAENG. She has also worked as a national and
international advisory board member for various reputed conferences. Her areas of interest
include genetic algorithms, machine learning, and fuzzy logic. She can be contacted at email:
shaurya13@gmail.com.
Dr. Shivani Agarwal is currently working as an Assistant Professor in
Department of Information Technology, Ajay Kumar Garg Engineering College, Ghaziabad.
She Completed her Ph.D. and M.Tech. in Computer Science and Engineering from
Uttarakhand Technical University, Dehradun. B. Tech in IT from UPTU, Lucknow. Dr.
Shivani Agarwal has more than 14 years’ experience in teaching and research. Her areas of
interest are soft computing, machine learning and bioinformatics. She has published many
research papers in different reputed International Journals and Conferences. She can be
contacted at email: kasishivani@gmail.com.
Dr. Atul Kumar Rai is currently working as an Associate Professor and Dean at
Kothiwal Institute of Technology and Professional Studies, Moradabad, have more than 16
years of teaching and 1 year of industrial experience. He completed his Ph.D. from Shri
Venkateshwara University, Gajraula, J.P. Nagar and M.Tech. degree from Rajiv Gandhi
Technical University, Bhopal in the Computer Science domain. He completed his B.Tech.
from UPTU, Lucknow. He has filed two patents, and published more than ten papers in
national international level conferences journals of repute. He is Member of Advisory Board of
QUBITOS Technology Pvt Ltd Noida. He is Cloud Consultant at Smart Brains Engineers &
Technology Pvt Ltd (hiring for HCL). His areas of interest include genetic algorithms, machine
learning, fuzzy logic and cloud computing. He can be contacted at email:
atulrocks@gmail.com.

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