The Beatles even cultivated this sort of personal connection to their audience. In their early songs, Paul McCartney says, he and John intentionally — somewhat calculatingly — tried to inject personal pronouns into as many of the early lyrics as they could. They took seriously the task of forging a relationship with their fans in a very personal way. "She Loves You," "I Want to Hold Your Hand," "P.S. I Love You," "Love Me Do," "Please Please Me," "From Me to You."
Don’t forget "And I Love Her," among a bunch of others. And by egomania I am referring to the audience not (only) the performers. This passage is from Daniel J. Levitin’s new and quite interesting The World in Six Songs: How the Musical Brain Created Human Nature.