What I'm looking for is some kind of holy class or prestige class that has music-based abilities. One of my players is playing a Paladin with max ranks in Perform: Sing, and he is always singing hymns in battle, and I thought it would be nice to offer him, through roleplaying, an avenue into a cool prestige class.
So, are there any good song-based divine prestige classes out there?
EDIT: Also, I know I read it somewhere but I can't remember. Do effects from multiple bardsongs stack?
EDIT2: Well, looks like I found my answer: "Divine Bard" in Unearthed Arcana. Looks interesting. Anyone got any other suggestions?