jams havent been used as openers in a while, espicially since you said you think you recognized it. it might have been wake up in a coma, as the meoldy has changed slightly from older versions.
funkadelic is probable night of the thumpasaurus peoples. If they said
I am high, you are high, we are high" in the first verse and then "gaga-goo-ga, gaga-goo-ga" over and over again after a jam, thats your song.