Avoid generic musical symbols like treble clefs, bass clefs, music notes, music staff. No violins, cellos, pianos. Focus on studio aspects, like recording engineers, mixers, audio in general. Go nuts.
MASTR Studios is an acronym for (Media Arts Symphony of Toronto and Recording). Because we focus on music production for all media, especially video games and film, we are fans of modern logos like Ubisoft and Xbox.
The word MASTR could also represent a character (ex. a grand master, warrior, king). Something epic.
Looking forward to your designs!