1964 - The Beatles

http://www.WatchMojo.com looks back at the 20th Century. In 1964, 40% of the US population tuned in to watch the Ed Sullivan show to watch The Beatles perform. This year the Beatles also held all 5 spots on the the Billboard Top 100 chart. To this day it's still the only musical group that has held this title. This was the height of Beatlemania.