Which musicians do you think significantly changed or added to their genre of music? To start off Les Paul was a brilliant guitar player who contributed significantly to the electric guitar itself (the Gibson LP is named after him as was the SG originally). Wes Montgomery changed the way the guitar was used in Jazz, and if you're talking about Jazz, you have all the greats, John Coltraine, Miles Davis, Duke Ellington, Louis Armstrong, etc. Bands/Artists which significantly added to the blues would definately have Clapton, Led Zep, Pink Floyd (and David Gilmour especially), Muddy Waters, Howling Wolf, BB King, The Allman Brothers, to name a few. To round of the genres, metal also deserves a mention, and you need Black Sabbath, Tool, and at least the 3M's of metal, Metallica, Megadeath, and Maiden. What other bands/artists do you think changed the course of music history?