Sheet music libraries in NRW

Can anyone tell me if there is a Library in either Bochum, Düsseldorf, Cologne or surrounding cities that has a good selection of sheet music from musicals? I know it is a bit of a quirky one but any help would be most appreciated!

in know in munich and in stuttgart i just went to the city public library. they usually had a music library too that also had sheet music. try google searching stadtbibliothek in your home town or whereever you want to look.

p.s. don't forget essen.

If you feel like a trip to the Münster region then there's the Landesmusikakademie NRW

There's also a library at the Folkwang Hochschule in Essen (the Folkwang is a college for students of the performing arts).