Cold Horn

A disease where a musical instrument (most likely made of brass) becomes cold. The cold makes it harder to play the instrument, especially when it uses a mouthpiece.

Cases of cold horn usually occur in cold climates (duh) or transporting the instrument outside while it is cold. (once again, duh)

This can be avoided by keeping the instruments mouthpiece in a warm place, like a pocket.

Another way to avoid it (if your a trombone, trumpet, etc player) is to buy a plastic mouthpiece