I'm not exactly sure what you mean here, only because I can think of several different ways of incorporating music into smut. Do you mean basing a scene off of a particular song (loosely or song-fic -like), using music as a poetic metaphor in the context of the smut, or incorporating music into the actual scene?

The first one is something I've been very roughly batting around as an idea - I have two or three songs that are gut deep passion and sensuality to me, but I hadn't considered making it so apparent in the writing so that a reader could recognize the song, if that makes sense.

As for incorporating music into an actual scene, well, that's kind of what I hope will happen in several places in my original fic, since it takes place in the music industry.