A live broadcast from WBAI's Free Music Store on December 4, 1971 organized by tuba player Howard Johnson (1941-). Substructure performs Operation soul, Been working too hard, Hold to God's unchanging hands, This Christmas (joined by Toby Hanks on tuba), (You make me feel like) a natural woman (with Yvonne Fletcher on vocals) and a composition written by Johnson called Here comes sonny man. The evening concludes with a grand finale of She's too heavy, featuring fourteen tubas.
This recording was formerly cataloged as BC0709.10B. Audio distortion present around 00:51:00.