All I've Got to Do is Thank You, Girl

One distinct advantage of having been born so very, very long ago, is that I got to experience the Beatles phenomenon firsthand.  No historian to my knowledge has ever captured the magnitude of these formative years of creativity.  Many tried to copy the Beatles, but every time some other group thought they had captured the "Beatles sound" a new Beatles sound had already emerged.  Each song of the Beatles defined a whole new sub-genre of music.  On first hearing a new Beatles song on the radio, the first reaction was a surprised "Who is that?" And then the recognition would dawn, "Oh, it's The Beatles. They sound so different from their last song."  The harmonic complexity would set each new song apart from the others. There were very few "three-chord thumpers" in the Beatles repertoire.  The complexity of the new harmonies would attract the imitation of orchestras, lounge singers, songwriters, and even bluegrass bands -- forever.

Here's a new insight into a very old (1964) Beatles song: