Well, from the initial reading, it sounded like the author of this game
wanted to embed a software synthesizer into his game to play the tunes.
In that case I figured that unless he could find some really nice engine
for producing realistic piano tunes, libmikmod or timidity (with bundled
samples) would be fine and take less processing power than a physical
modelling software synthesizer or something. It didn't sound to me like
he was intending on using general MIDI (which gave me an extrememly
biased view of MIDI as a whole until I started collecting controllers
and rack gear myself... ;P).
Cheers,
784 - Michael C. Piantedosi - drclaw(a)dogsolitude.org