Geezzzzzz, I thougth I knew 4% of what you know from your 4% of Geoff
I'm down to 0%. I don't even know one of them
But I have some other names of guitarists who were "Avant-garde" at their time and
still are :
Tarrega : for the classical musicians he was the Chopin of the guitar.
Django Reinhardt, Charlie Christian (electric guitar), Chuck Berry, Jimi Hendrix,
Manitas de Plata

Paco De Lucia, Al Di Meola, ...
All the other great guitarists have been inspired by one of them.
Of course I certainly have missed some other names !
I have copied the list, I'll try to grow up to 1% for the next four weeks.
Moondog