I have this discussion with pals from time to time- What is the most important thing in the history of Rock n Roll? There's a lot to choose from. Is it Rock Around the Clock? Elvis? The Beatles? Chuck Berry? Stones? Dylan? Woodstock? The blues guys who inspired rock?
I always come back to one thing- Les Paul. Without that electric guitar he perfected, I don't know what direction music would have taken.
As for musicians, I really look at Bob Dylan. He took the electricity of the Beatles & Stones, (who took their inspiration from guys like Chuck Berry) and added the lyricism and relevance to rock music. But that's just my take....