Of these singles, I believe the most significant to be "Please Please Me." It was the second single ever released by The Beatles and their first huge hit in the United Kingdom ("Love Me Do" did well, but was not a megahit). I also believe it is also the earliest example of a power pop--electric guitar driven music combined with Everly Brothers style harmonies. "Please Please Me" is then historic on multiple levels. This is footage from their historic February 1964 convert in Washington, D.C.
Book Review--The Art of Selling Movies
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