The great British improviser Derek Bailey is one of the most important and respected non-pop guitarists to come out of the UK music scene. After doing a few straight-ahead gigs, Bailey went the free-form route and co-founded Spontaneous Music Ensemble, as well as Music Improvisation Company. In 1970 he co-founded the first musician-owned improv label in the UK, Incus Records. To listen to Bailey, you would have to throw away every conventional way that you have heard guitar. He plays improvised music, with little concession to pop or rock (or even jazz). Throughout the years he has collaborated with Evan Parker, Anthony Braxton, Jazz Composers Orchestra, John Zorn, Cecil Taylor, Ruins, Cyro Baptista, Johnny Dyani, Thurston Moore, Steve Lacy, Fred Frith and many more.
Here is the full album to his 1975 classic Improvisation: