The Beatles changed the world with their music in the 1960s. They influenced countless bands that followed them and gave a voice to young people around the world. It is hard to imagine that the Beatles were themselves influenced by anyone, but they did have their heroes. Growing up in England, they idolized American bands and singers, and those artists influenced the Fab Four's image and musical growth. On John Lennon's birthday, October 9, we take a look at some of the Beatles' inspirations.