I like their pop/bubble gum stuff, but they had a couple albums that were pretty soulful and funky. Like the title track from the "Bizarre" album. This is a great tune:

https://www.youtube.com/watch?v=7jM2elgVi1k

Watch the "Unsung" episode and you'll see why things fell apart. Greedy/no good manager took all their money and didn't promote the group, pretty ridiculous stuff.

Too bad their later work went unnoticed.