Yeah a Music PhD would be cool... Also on that note I think U Penn does the same thing as Yale and Chicago. It seemed to be Columbia handles theory / musicology apps separately. Brian Kane is a cool scholar. And I know he has been the primary advisor on several musicology dissertations.
Though I do think there is virtue in having a lot of depth in the methodologies of one subfield. Sometimes I feel when I spread myself too thin, the whole ends up being less than the sum of its parts. But as I'm sure you know, philosophy definitely corresponds with music(ology, theory) in many ways.
In any case you don't get an interview (and waitlisted to boot) at NYU if you dont have an interesting project, especially with their level of competitiveness this round.
What's surprised me this round is that whiile my research is on Russian music, all the places with Russian music scholars have rejected me...only ones without them are interested. Lol