Musical Instrument Collections in North Rhine-Westphalia

Which musical instrument museums are there in North Rhine-Westphalia?

The German Music Information Centre (miz) lists musical instrument museums and collections in North Rhine-Westphalia, which are either independent or appear as departments of larger institutions, e.g. state, regional or city museums, museums with a cultural-historical focus or universities. In addition to these institutions, there are other museums that exhibit musical instruments within the context of other topics; The miz does not take these into account due to their usually small collection size.