December 1976, Zappa performed at the Saturday Night Live tv show with his band.
Checking out the footage, Javier found out that the Zappa band guested two musicians from the Saturday Night Live house band:
Cheryl Hardwick on keyboards (who later wrote music for the Muppet Show)
Bob Cranshaw on bass.
Both now have an entry at the United Mutations archives, 'though I could use a bit of extra info...
-- info: Javier