This document discusses the impact of auto-tune technology on the music industry. It describes how auto-tune was invented and how it allows correction of pitch in singing. While initially used to hide off-key singing, auto-tune became popular with many artists in the late 1990s and 2000s and is now easily accessible through apps. However, some argue auto-tune has negatively impacted the music industry by covering up artists' true vocal abilities and "killing real music". The document also discusses how music distribution technologies like CD players, MP3 players, and iTunes have shaped how audiences consume music.