"One-off" songs

[airbrakes]

Stumbling through youtube videos of 80s concerts earlier I found this:

http://www.youtube.com/watch?v=fXzWWf3w3hQ

It appears to be a one time only song, written specifically for the FarmAid concert and never released. Some say a studio recording exists, others say no such thing was ever made. It got me thinking - what other songs are there that were only ever done once by a band? (Original songs, covering someone else's song as a concert interlude doesnt count). I bet there are some hidden gems out there that gave gone largely unheard of by even the most ardent of a band's fans. "Plundered My Soul" by the Stones was another good example of this until someone found the original recording stuffed in a filing cabinet 40 years later and the band chose to release it on a new album.

[EwingJR]

I don't know if it counts as it's quite similar to another song of his (but better), but Phil Collins' 'Rat Race', written for the Miami Vice episode Phil the Shill.

http://www.youtube.com/watch?v=ss4jbv3wVSg

It was based on a lesser-known song of his called 'The Man with the Horn', which was the B-side to one of his singles, I think. Maybe Sussudio?

[Seeker UK]

Jean-Michel Jarre did a whole album as a one-off

http://en.wikipedia.org/wiki/Music_for_Supermarket...