Trademark Class 15
According to Nice classification heading for class 15 states Musical instruments are include in Class 15. The heading gives you a brief broad overview about what exactly is including in a particular class.
This Class includes, in particular: – mechanical pianos and their accessories; – musical boxes; – electrical and electronic musical instruments. This Class does not include, in particular: – apparatus for the recording, transmission, amplification and reproduction of sound (Cl. 9).