I like the Cowsills...Susan Cowsill has put out some excellent solo stuff and her work with the Continental Drifters was excellent as well.
Hell, I'd put the Cowsills in there....
I've alway been amazed that in a band like the Continental Drifters, with Vicki Peterson and Peter Holsapple, Susan Cowsill is the one who stands out. Her songs are wonderful. I've never gotten around to checking out her solo stuff, but probably should.
I remember one of my favorite all-time bands, The Smithereens (who should also be in the Hall, IMHO), reunited some of the Cowsills to do backing vocals on one of their songs.