In terms of experimenting, I think the Beatles certainly had an element of it, but were behind groups like Captain Beefheart, VU and the Beach Boys. Those bands were doing much more interesting stuff.
The Beatles, however, were the greatest force for popularizing whatever they dabbled in.
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"Blow your tuneless trumpet, the choice is yours / We don't want the glamour, the pomp and the drums / The Dublin messiah scattering crumbs"
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