Tour(s) on which song is known to have been performed (main source: FZShows, v. 7.1):

• March-May, 1980 (North America) <rehearsals>

Comments:

Jon Naurin on the FZShows Homepage:

This cool riff actually appears on on tape (the 29-Jan 1980 rehearsals), but appears to have been part of a larger composition, along with Mystery Song #1.