^^^^^^

Yes, they did evolve, to their credit but as a previous poster mentioned it was George Martin who was the impetus for that evolution. The Beatles became a pretty solid psychedelic/concept album band, but they weren't the first or the best in that jondra. Listen to the Moody Blues' "Days of Future Passed" from 1967 and it becomes clear that The Beatles were far behind the curve and would never have caught up with the White Album and Sgt. Pepper's had it not been for Martin.