The Malagasy rosewood is used to fake the older hongmu (red wood) furniture, which was originally made with localy grown rosewood which is very heavy.

I have a number of old pieces I bought in Shanghai.

With regards musical instruments it is often used in the flat harp and zithers as a base.

Having seen the locally made guitars in Shanghai I do not think they would use it too much as they are very cheap and very nasty.