Day Tripper-Not necessarily Harrison's best guitar riff. But, for me, it is the first where I realized Lennon-McCartney's songwriting showcased Harrison's talent in a way his own songwriting never could. I was a "George" girl when I was little. Later, when I grew up, I was crestfallen to realize he was a terrible songwriter. See my comments elsewhere on what made The Beatles so perfect, yet each was merely OK (Lennon), really bad (Harrison), or horrifically bad (McCartney) individually--IMO.