JUDEE SILL

Jan van Kemenade found former Zappa keyboard player Bob Harris mentioned on Judee Sill's eponymous album (from 1971).

http://rockasteria.blogspot.gr/2014/07/judee-sill-judee-sill-1971-us-beautiful.html

Furthermore, Judee Sill's 1973 "Heart Food" album features Jim Gordon and Emil Richards (who both worked with Frank Zappa) and Lynn Blessing (who worked with Flo & Eddie)

http://rockasteria.blogspot.nl/2014/11/judee-sill-heart-food-1973-us-wondrous.html

And then there's the Tommy Peltier / Judee Sill collaboration album called "Chariot Of Astral Light", featuring Dave Parlato, Bob Harris and Lynn Blessing.

http://rockasteria.blogspot.gr/2014/09/tommy-peltier-feat-judee-sill-chariot.html