If you haven't seen George Clinton before ... he really brings all 30 people out on stage at once. Everyone had a different funky costume. Quite a spectacle ... from what I remember :-)
As for the Beastie Boys, that's about the time when "Sureshot" just came out. Before that concert, I thought they would come out on stage with just the DJ. I had no idea that they each play their own instruments.
With George Clinton's P-Funk All Stars, you don't need other bands on the bill. The 30 members take turns trading off on the stage and they play for 3-4 hours non-stop (but they are real songs, not just jams).