God.. I mean a lot of the people you guys list have talent.. but lets look at some *really* innovative musicians:
Jimi HendrixOne of the most innovative musicians to ever live, his music became the definitive sound for an era where music was at its greatest.
Eric ClaptonJust watching this guy play the guitar puts me in a mood where I can't put down my guitar for a week afterwards, he's old as hell, but his music is timeless.
Johnnie JohnsonCo-Collaborator with Chuck Berry, and credited with the "driving undercurrent" in many of Chuck Berry's songs, such as Johnnie B. Good.. incidentally also the person of whom the song is speaking.
Chuck BerryIntroduced many innovative techniques into the music scene, considered by many to be the Father of Rock and Roll.
Les PaulNot only one of the greatest guitarists who ever lived, but also pioneered much of modern guitar design. He is credited with the creation of the solid body electric which replaced the arch-top electric used through the 40s and early 50s. The 1960 Gibson Les Paul is still the single best guitar I have ever had the privledge of playing.
Bob DylanStarted the "Folk Rock" revolution in 1965, giving birth to the style of music that predominated much of late 60s early 70s rock and roll.
Kurt CobainAlthough there are many musicians that deserve credit between Dylan in 65 and Cobain, I realized this list was getting rather long, and couldn't neglect to add the lead of my favorite band (Nirvana). Nirvana's release of the "Nevermind" album, more specifically the song "Smells Like Teen Spirit" exposed the Grunge Rock movement to the entire nation, where before it was concentrated in the Seattle musical "underground." While the popularity of Grunge Rock has faded, its influence is still very evident in much of modern rock.
A lot of current bands and musicians are amazing in thier own right, but the people that I've listed above have made contributions that have changed the face of music forever. They are the true great musicians that will be remembered as the innovators of thier time.
(Also note, every person listed here has long been inducted to the Rock and Roll Hall of Fame.. this isn't just my opinion
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