I've peeped the one collection of Roots VS. J-Dilla that Mr.15 put out there but it seems that was just the tip of the iceberg of joints the Roots did, it seems like they probably covered at least 75% of his beats (and probably all of them far as we know); I'm a J-Dilla and happened to have been lucky to found a few leaks of the his beat-tapes but not that many cause it was quite a few beats I didn't recognize.

From the tubeyou video comments a lot of people were complaining about not seeing people dancing but c'mon these days people don't dance to real hip-hop music anymore that's for lounges.