nanny- unfortunately, most girls these days listen to non jewish music. in most BY seminaries, you wont hear the music out loud though. and by the way you described yeshivish with never showing the knees… sorry but its not going to be that way. unfortunately, a majority of the girls have a hard time with that.
and nanny- sorry but meohr is academic with a lot of work and a lottttttttttt of class. but the hashkafa balances it out. it is hard to get into but you will get in if you are right for it.
good luck wherever you end up!!