Top 40’s Music Hits Feel free to share ! The 1940’s were a time of great changes, both in the United States and around the world. 1940’s music eased these changes.This decade introduced a time of big band music. This style of music was very popular with young people and was often played at dances.Enjoy these blasts from the past tunes ! Some music videos may be blocked due to copyright issues (sorry). Feel free to share !