Bands with multiple guitar players are everywhere, but multiple bass players seems to be rare. Here are a few I’ve stumbled across…
Monobody: Monobody on Audiotree Live (Full Session) - YouTube
La Fin Du Monde: La Fin Du Monde - YouTube
Ned’s Atomic Dustbin: Ned's Atomic Dustbin - Grey Cell Green - YouTube
Does anyone know of other multi-bass groups?
Oh yes… see
The Omnific : The Omnific | Objets de Vertu [Official Music Video] - YouTube
Wow I don’t know any of these bands @lucas9000 @gmunatsi! I’ll take a listen.
This Ornette Coleman record has two bass players -
Also this thread wouldn’t be complete with some Superbass -
And some Bass Extremes!
EDIT: Also, just so you guys know, if you put your Youtube links on their own line in your post (hit enter/return, paste the link, hit enter/return again), they’ll automatically embed like in my post. Pretty cool!
Maajong, Happened across these guys by accident on YouTube. Two bass players, a drummer and a variety of horns. Songs called Wavering, Wavering 2.0, Kittt, and Kittt 2.0 are really good. I think you can find them on Facebook too.
Saw the thread title and was arming myself with Ned’s Atomic Dustbin links 
I think the ultimate for me has to be Freebass though, the all-Mancunian bass supergroup formed by my favorite bassist, Peter Hook (of Joy Division and New Order fame):
Just Peter Hook and Andy Rourke (of The Smiths) are enough to take this totally over the top; adding Mani (from Primal Scream) is ridiculous overkill
Whoah. I definitely didn’t know this existed. What a rad share! Thanks for the heads up.
How about 3 drummers? All with trapsets. King Crimson 21st century schizoid man.
Late to this party but The Omnific are amazing!