So, I've finally gotten around to dealing with the music, as mentioned below. The game right now will run about 500 MB instead of 1 GB, with 1 rar for the main game, and 3 rars for the vanilla music. There will still be the extended pack (which right now is only 1 rar for beta1-5 music) and will be extra packs for beta5+ music. Do let me know if this works better for you guys or not.
On Music:
The normal battles I try to keep unique in that every playable character has their own battle theme. That's definitely something I don't want to change.
As for bosses, in the vanilla version the only boss themes there are: G Free ~ Final Dream (for regular bosses), Chaos (for the guardians of Pandora), Gensoumaroku's OUT!!! (for the fragments of Pandora), and the FFMQ Battle remix (for special fights such as Kisume, which are mini-bosses I suppose). Some bosses get to keep their unique boss themes, being: Eirin, Kanako, Tenshi, Saigyou Yuyuko, Mima, Elis, Rikako, Kana, Marisa, Alice , Suika, and PC-98 Yuuka. The reason for them keeping their theme is they're more plot-important, so why not?
As it stands right now, there are ~128 songs now for the vanilla version (beta1-5, or what there is for beta5). Which runs to about 500 MB for music now. Better than 1 GB. I have also put in options for switching between music at save points and at the Human Village, for those that get the extended pack, and bosses have been tuned to go with this as well.