This is the scene in "I'm Not There" we told you about that Marcus Carl Franklin - the dustbowl Woody Guthrie "fake" - sings along with (so he actually sings twice in the film). Richie Havens' rendition of "Tombstone Blues" is pretty rollicking. This clip is taken straight from the film as is.
The Variety webblog has a pretty cool piece on finding Bob Dylan's original master to "I'm Not There," that's slightly deeper than "found at Neil Young's ranch." Apparently the version they found is kinda different to the popular bootleg floating around and features The Band backing him up (though the versions we have, the differences are very subtle). As many have noted, the song is more of a freeform sketch in progress than a fully-realized song, but that gives it its own unique qualities. "The lyric is open ended. It's hard to tell if (the words) make any sense," Sonic Youth's Lee Ranaldo said. Randall Poster said his partner on the soundtrack, Jim Dunbar, "had to be [detective-like], trying to make all these connections. What helped us get it quick was having the support of the Dylan camp."