The musical instrument thing is transitory and depends entirely on the instrument.
Pre-relationship; in a popular band playing a more traditional instrument like guitar with a bunch of also attractive people (or at least part of a cool local scene) = hot
In a relationship and/or solo bedroom producing any kind of electronic music and/or buying lots of synthesizers, drum machines or grooveboxes = not hot
Also note how low "clubbing" is on the least attractive list, so no, DJs and electronic musicians who perform live don't get a pass
seriously? I've known several women that fucking love banjo. I would say I've heard more women talk about how cool banjo playing is compared to actual guitars (then again I think it's just a known thing with guitars that doesn't need to be brought up). It might also depend on where you live I suppose. Roll into an Appalachian town stringing a banjo and you'll be the pied piper of the mountain women.