I am within a few tracks in this massive project.
(specifically 416, 417, 433, 441, 444, 457, 459, 476, 477, 478, 479, 480, 481, 482)
http://archive.org/details/ecaclv6

Hal McGee sent out one minute of sound to nine people, asking them to listen to only the last five seconds and then add their own minute and send it to nine people who would only listen to the last five seconds and add their own minute and send it to nine people ….. until a ninth person in the chain was reached, then it was sent back to Hal for compiling.  This is volume 6 of the results!

A modern surrealist exercise in randomness and exploration of collaborative creativity.