Rock journalists, music critics and industry professionals weigh in on the lasting influence of the Beatles, a band best known for bringing the British Invasion to America -- and for recording some of the biggest hits in music history. Highlights include cuts from "She Loves You," "Yesterday," "Twist and Shout," "Love Me Do," "Please Please Me," "All My Loving" and "Ticket to Ride," plus commentary from former Beatles sound engineer Norman Smith.