"music composer" vs "musical composer" [closed]

A UK guy told me that Mozart was a musical composer.
A US guy told me that Mozart was a music composer.

Is it a regional difference?

It may be a regional difference, but both adjectives are completely unnecessary. Mozart was a composer. People who compose music are called composers.

That being said, strange as it may seen, some compositions are considered more "musical" than others; i.e. melodious and harmonious. But I've never heard a composer referred to as "musical" - only a composition.

A "musical" is also a specific type of theatrical performance, so one could say of a composer who is not well known, he composes musicals.