Mystery To Me Jam: Live TV
 

Until today I'd never seen this before:

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

But now I realize it's just footage of another song over a recording. Not an actual TV performance.

It's just audio set to the Rock Concert video. However, I've never heard this before.

It's the last encore tune on many of the '74 tour shows...I think the recordings from the Shrine Auditorium in LA, some copies of Will The Real Fleetwood Mac Please Stand Up? and the Live From Hempstead Studios have different versions of it. According to Bob Welch, it never was a finished song, but because he sings "Mystery To Me" in a few spots, that's where its name came from.