The distance between musical notes

Today’s quick calculation exercise is to calculate the relative distances between different musical notes and a trombone player’s face. Watch this video of a trombone player playing a tune on a trombone. A GoPro camera has been affixed to part of the trombone, and aimed at the musician’s face:

(Thanks to investigator Dorothy Bond for bringing this to our attention.)

UPDATE: That link went bad. We replaced the link on March 3, 2013. If that replaced link goes bad, tough.