Mike Upchurch, et al: Greenboy, Prescription for Death

Dragnet meets the 21st century.

link to YouTube

Peter Bergman: cutups

Before Firesign.  The first is what's referred to as a "stutter tape", apparently from his college days in the late 50's,
Yale Distorts (8:33)

And a couple of group-written poems, from Radio Free Oz, on KPFK in 1966.
phone in poem #1 (0:46)
phone in poem #2 (1:19)
Presented just as they were broadcast for your mixing pleasure.

William S Burroughs: Towers Open Fire

(9:34)  Weird Movie Night.  For the old man's 101st birthday. A short film from 1963.

Towers Open Fire

...and more films on that same estimable site.

Noah Creshevsky: Highway

(8:53) ...that little picture at the center .  No, that's not Creshevsky.  Up a row.

YouTube