Just a quick contribution before lectures start, I would guess the music of the dwarfs, gnome and drow would be significantly different from that of surface dwellers, because of the different acoustics underground. Maybe they would go in for more Gregorian-chant style songs. But I've always imagined dwarfs as being a bit tone deaf, so they'd probably not have much in the way of melody. I don't think they'd have much progression from the tonic chord, so it could sound really monotonous. But I think they'd have really interesting harmonies, possibly octatonic (like Stravinsky), just because I think the scrunchy chords you can get from the octatonic scale (C,C#,Eb,E,F#,G,A,Bb,C) are the sort of thing that would appeal to dwarfs. I'll try recording something that sounds about right and posting it on the alchemy site. Their lyrics would obviously be concerning their great dwarfish heritage, possibly in the style of Wagner's Ring (a la Terry Pratchett). I'll write more later, but I've got lectures to attend!