a PF fan site listing what seems to be a definitive PF song list with a breakdown of who sang which songs that were recorded between December 18, 1969 and September 5, 1973: http://www.cmongethappy.com/aguide/recordingsessions.html besides Shirley Jones and David Cassidy, the 'core' group of actual singing voices were Ron Hicklin, Tom Bahler, John Bahler and Jackie Ward, with other additional singing voices in specified songs.