Joni & JT sing Mr. Tambourine Man

Available only from the project's website is Amchitka: the 1970 concert that launched Greenpeace. The first disc features Phil Ochs & James Taylor, the 2nd disc is Joni Mitchell.
During her set, Joni's own Carey segues into a nearly 7 minute Mr. Tambourine Man, with JT joining her midway.

The CD is available only from amchitka-concert.com