Most reed instruments instruments have keys or finger holes. Most brass instruments have valves. There are brass instruments with keys, though, like the (fairly unsuccessful) keyed bugle. I can find ...
When I remove the valves of a piston tuba, do I remove the spring also?
I understand how trumpets work - valves open to force the air through crooks, which lengthens the pathway the air must travel, thus decreasing the resonant frequency. The question is, why are ...