Seriously, there's tons of Great singers here (So happy, I've never had a karaoke buddy.)
But as for a one-person thing
:
It does, but unlike the opening song, you can get by pretty easily with one.
The opening song (My Heart) Needs at the very least, two, but three is best.
Yeah, Congratulations can be one, More would make it smother and prettier, but the second/third wouldn't have to do lots if they didn't want to. (I have been playing with my karaoke tracks, how could you tell.)
But I'm just a singer, I think it would be AWESOME on Piano (Squall doing like, fifty trillion parts all like...ninja pianist.)