Now here's a toughie.

Amongst other instruments, I play the guitar (I also blow my own trumpet ) Who was the greatest rock guitarist ever? I tried to include a broad mix of musicians but mainly those whose works are still popular across the public spectrum and still with us after decades, so many modern guitarists didn't make my cut. Feel free to honourably mention such luminaries as:

Eddie Van Halen, Ritchie Blackmore, Tony Iommi, Chuck Berry, Brian May, Pete Townshend, and many more....