https://www.youtube.com/watch?v=OuphMxyPWeA#t=26
I think this was recorded for Beat-Club (not for the MusikLaden, which replaced Beat-Club on December 13th, 1972). The show was broadcast on March 25, 1972 (referred to as Episode #1.77)
In 1972, with an already embarrassingly rich resume Stephen Stills career with Buffalo Springfield, Super Session, CSN&Y, Stephen Stills’ finest hour was still to come. Along with ex-Byrd/Burrito Chris Hillman, Stills co-founded Manassas and issued a 2LP set that was called “a sprawling masterpiece” . Manassas was barely 6 months old when they convened at the film studios of Germany’s Radio Bremen to record this excellent 35+ minute live performance for the TV show, Beat Club. Released on DVD in 2000 and reportedly, the only visual documentation of the band, Manassas, with no audience, expertly fusing Stills’ musical passions (blues rock, Latin & country) into a distinctively potent blend. Note this set’s suite of songs, beginning with “Song Of Love” and running uninterrupted through to “Jet Set (Sigh).” Instead of concluding the run as originally recorded on the LP (with “Anyway”), Stills throws the band a live curve ball (you can actually see and hear the momentary confusion at the 20:45 mark) and, in front of the rolling cameras, kicks off an extended jam instead (at 22:00). The DVD is worth owning just to see Stills’ short-lived Manassas in performance mode, something most of us never got the opportunity to experience. Find the DVD at Amazon,

Manassas was a fairly short-lived project, but a highly creative one. The double album was in a sense a concept album of different genres from which the band could quite easily and most skilfully draw upon.
The core members of Manassas were:
Stephen Stills: vocals, keyboards & guitar (CSNY, ex-Buffalo Springfield)
Chris Hillman: vocals, mandolin & guitar (ex-Byrds, Flying Burrito Brothers)
Al Perkins: steel guitar & guitar (ex-Gram Parsons and Flying Burrito Brothers)
Calvin “Fuzzy” Samuels: bass, backing vocals (ex-CSNY and John Sebastian)
Paul Harris: keyboards (played with John Sebastian during 1968-71)
Dallas Taylor: drums (ex-Clear Light, CSNY and John Sebastian)
Joe Lala: percussion, backing vocals (ex-Blues Image and Pacific Gas & Electric)