Violin, mostly. I once had a good friend who was a violinist. I enjoyed writing things and hearing him play them. Now my musings seem reserved for the piano. Perhaps I'll be inspired to compose a piece for the lute some day.

[ He flashes Mat an amused sort of look, then tuts his tongue thoughtfully. ]

The more you learn your instrument, the more you'll find you think of those notes and chords without realizing.