It depends on what you want to say. Different music style means different kinds of music (romantic, baroque, hard rock, rock'n'roll, boogy etc.).

Whereas musical style refers to the expression when making music (playing an instrument, singing).

Hope this helps.

ok thanks you helped me

The archive (Suche in allen Foren) is a good place to start.

To me 'music style' is less idiomatic than 'style of music' or 'kind of music.'