THE GAP IN THE GENERATION GAP. Ravi Shankar? "You don't know who Ravi Shankar is!?" My only observation on "changing the direction of rock and roll": compare and contrast Side 1 and Side 2 of Sgt. Pepper's Lonely Hearts Club Band. (Those of you who have only the CD version: the first side ends after Mr. Kite tops the bill.) The first side is pretty much vintage Beatles. The second side introduces the sitar and some of the other trappings of "acid rock" and that's the side the intellectualoids swooned over, which might have marked the beginning of pop-culture studies as an academic adventure.
On the other hand, if you play The Beatles 1 none of that stuff shows up. The cheerful stuff generally rules.