I just hosted a Rock Band tournament Saturday and had 8 teams of 3 and did a bracketed tournament and everyone had a blast.
Can we get some more details about the tournament rules?
Some things to consider:
If you play song A "perfect" and song B "perfect" the score on song B may be 3x the score of song A based on how long the song is and how many notes are in it. . . .
Only bands with the same number of people will really be able to be compared by score. . . Is there a set band size you want ? 3 or 4?