performer [uncredited] Bill Bruford
performer [uncredited] David Cross
performer [uncredited] Jamie Muir
performer [uncredited] John Wetton
performer [uncredited] Robert Fripp
Recorded At Rainbow Theatre London
Recorded at The Rainbow Theatre, London on Wednesday, December 13th, 1972.

These files are the downloadable content of the King Crimson release in the 40th Anniversary Series Larks' Tongues In Aspic - The Complete Recordings, a 13 CD issue with a DVD and a Blue-ray.
From the notes of the box:
See back of reproduction of Rainbow Theatre, London concert ticket to obtain the concert from that venue as an exclusive download - listener beware - audio for this show is of such poor quality as to be beyond meaningful restoration and is included solely for historic purposes.