This game's soundtrack seemed to be overlooked by remixers and piano players and whatnot.
Here's some musics from the first Summon Night game that think needs midi:
Central Craftsman Castle http://www.youtube.com/watchv=Jl5VfXYtVfU&list=PL392784AE8CE5A03C&index=7
Together with you
http://www.youtube.com/watch?v=TyspcHlBWco&list=PL392784AE8CE5A03C&index=10
Last Bastion
http://www.youtube.com/watch?v=bppqD1HK_c8&list=PL392784AE8CE5A03C&index=9
I Must Not Lose The Battle!
http://www.youtube.com/watch?v=UOaceL2ZT_E&index=21&list=PL392784AE8CE5A03C
I know Echo did "I Must Not Lose The Battle!" Not sure if he posted it anywhere though, so you may want to ask him.