Music originated with the singing stones, the galeb duhr, who would sing to the rocks of the mountains to help herd them in their own strange way. Music is the ability to create tunes and songs in all their forms.
Music is popular with humans, elves, fairies, gnolls, gnomes, goblins, kender, kobolds, lycanthropes, orcs, and the sylvanites. It is obviously a popular gift, with many races seeking to express themselves musically.
Combined with mechanics, music allows musical instruments to be made.