Bone-cam.
I can’t believe I’ve never seen anyone do this yet. Dave Finlayson, trombonist with the New York Phil, gets clever with his video camera. The performance is great but… I just can’t stop laughing.
[youtube http://www.youtube.com/watch?v=soDn2puEuL8&w=420&h=315]
Aside from the entertainment and the performance itself, anyone who wonders how a trombone works is getting a close-up look. You can actually see the various distinct positions the slide has to be held at, and the quick but fluid motion necessary to get between them for a clean change of pitch.