I love the Beatles and I believe they are easily the most important and most influential band in pop and rock history. No contest. Bust that statement is patently absurd, and speaks only of one's ignorance. 1466-1966? Good lord. That is a frankly embarrassing contention. Beethoven, Mozart, Louis Armstrong, Miles Davis, Chuck Berry, Mahler, Schoenberg, Coltrane, Elvis, Robert Johnson. Come on.
And even more so, that track wasn't THAT influential. It had a mild effect of adding the general psychedelic trend and that is about it.
For me, its hard to say which was most important, I think many were important in different ways. Obviously Eleanor Rigby and Helter Skelter were both important, but for complete different reasons.