How you manage to get an apostrophe into this is beyond me. I am chief of the apostrophe police and cannot find anything wrong with this thread in that respect.
one is an adjective ( musical ) and one a noun in apposition ( music )
Times had a discussion on this a few years ago - over "Neonatal Secretary"
I mean a mad secretary is one who is mad so is a Neonatal Secretary a secretary who is aged four weeks or under or is she a Secretary dealing with neonatal admissions ?
Clearly a light news week for the Times
Surely if you said - Musical Room some wag would go up to the door, listen and say when its not very musical now !