The Neil Young album "Arc" is made up entirely of feedback snippets (originally from the beginnings and ends of songs on his 1991 tour with Crazy Horse) spliced together.

http://en.wikipedia.org/wiki/Arc_(album)

I saw him on that tour, it was a great show and Social Distortion and Sonic Youth were on the bill, too, so it was absolutely eardrum-shattering. The Neil fans in Landover, Maryland, were not friendly to Sonic Youth, few people appreciated their genius....guess they just wanted to hear "Hey Hey My My"

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Guitars:
Gibson SG Classic; 1986 MIJ Telecaster, Custom '62 Reissue w/Bill Lawrence pickups; Epiphone Wildkat; Martin D-1; Takamine EG140SGC acoustic-electric; Yamaha C40 classical; and an old Applause acoustic-electric I use for slide

Pedals:
MXR Dyna Comp; Crybaby Wah; Boss TU-2; Ibanez TS-9; Boss SD-1; Electro-Harmonix Small Stone; Boss TR-2; Ibanez DE-7

on the shelf: MXR Micro-Amp; EHX Double Muff; Frantone The Sweet; Ibanez CPL (can't figure out how to make it help me...)

Amps:
Laney LC30-II; Harley-Benton GA5 (Epi VJ w/EQ knob!); Fender Princeton Chorus; Roland MicroCube