Battles musics trigered with chains of sounds each party member could do with a special item or instrument. But more like having a single note magic flute.

When in a group, peoples can start a chain of notes depending on what flutes you have. Would be as easy to play then any other actions. No animation, just the sound. From there :

-Music coresponding to the first note played would start
-Music would fit the effect trigered. Ex:
-slowing enemy would trigger a slow song
-Raising def song would start something more heavy

-Simple flutes with C G Am would be commom stuff, while some other notes would be rare and could trigger kicking ass songs with nice battle effect.
-Would greatly augment party fun (i think)

Thats it... lot of possibilitys. Once again excuse my english.

What do you think?