This document discusses three types of research methodologies - historical, descriptive, and quasi-experimental - that have been used to study the effectiveness of the Kodály philosophy of music education. It summarizes several studies from the 1960s to the 1990s that employed these methodologies. The studies found correlations between Kodály instruction and improvements in children's movement, personality development, academic performance, and music achievement. However, the document notes that more replication studies are needed to better understand the impacts and draw stronger conclusions.