I originally posted this as a reply to a very old topic, but it seemed a bit non-sequitor. So, here goes:
I've noticed that INFps tend to approach music from a more left-brained (you could say ) perspective, as opposed to a right-brained (you could say ) perspective. We aren't termed "The Lyricist" for nothing. When INFps approach music, they tend to observe the underlying "narrative" of a piece of music. It is a reflection of the theoretical aspect, although INFps are usually not attracted to music theory, and will almost always justify the theory as a function of a more verbal, emotional pathos. Compare this with the approach of an INTp/j musician; INTxs often observe music from the opposite standpoint - using theory as the basis for their understanding of the music. Instead of justifying the theory by means of a pathos, they will often speak of theory as existing for its own sake.
I've noticed this even in the posts of INTx musicians on the forum, Cone and theodosis among them. I've also noticed a trend while visiting conservatories last year for auditions; there seemed to greater proportion of INFps in the Voice department of the school as opposed to those studying a non-vocal instrument, such as viola, piano, etc. The instrumentalists were more generally INTxs. (Perhaps Rocky's theory of NFs having a developed verbal motor function could apply here.) I also tend to think introverted types in general produce more cerebral music; extroverts tend to think of music as more of a diversion than anything else (as background music for dances, clubs, parties, etc. or as a social occasion), and thus, are more aloof to both the theoretical (Te) and emotional (Fe) implications.
Just putting this out there...