Ooh, fun topic. It'd be Dream Theater + others. For those of you who don't know....
John Petrucci on the guitar.
Mike Portnoy on the drums.
John Myung on the bass.
Jordan Rudess on the keyboards.
And the others would be
Ayumi doing vocals
Vanessa Mae on the violin.
Femi Kuti on the trumpet.
YEAH! I have no idea how that would sound, but I would be their biggest fan.