Oh old horns are such a hoot. I have two myself and I enjoyed them for years. Now I have other passions...and besides I never got the coordination down. I became a much better singer over time than I could ever play! No hand, eye, finger, breathing muscle movements!
One challenge to always watch for on these lovely subjects are reflections. If you can keep them as controlled highlights I think you can really appreciate the beauty and craftsmanship of these musical instruments. So if you cannot get a good shot full or partial shade bring scrim into the photo shoot to reduce the lighting's dynamic range to something your camera can capture fully.
Well now it is time to get the big kids off to their music lessons! One Violin and one Cello need exercise!