If two players are competing on the same song then just eliminate the loser, simple! Use pro face-off where both players plays all notes. This system is completely based on score which is the only thing that should be judged. The better use of star power and the longer the streaks the higher the score! Score can vary a lot even if percentage is the same.
To make it more fun to the audience, judging on score, difficulty and stage performance is better but then it's also best to play 1 guy at the time. Score must then be converted to a 1-10 point system relative to the maximum achievable score (refer to
Score Hero's top scores). Also, song difficulty must be weighted in, perhaps by ranking each song from 1-10. I think there should be a few judges that judge the stage performance only. A lot of work to set up but quite fun for all attending.
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