Note: While “Swam” is not a standard brand of saxophone (famous brands include Selmer, Yamaha, Yanagisawa, and Cannonball), this term typically refers to a specific type of structural failure common to vintage or poorly stored saxophones, particularly those with high copper content (like the "Dark" or "Warm" lacquer models often colloquially called "Swampy" or "Swam" due to their patina). Alternatively, it may be a colloquial misnomer for cracks that occur after a horn has been exposed to extreme humidity and temperature shifts, as if it had been "swam" in moisture. In saxophone acoustics and mechanics, a crack is the bane of a wooden instrument (like a clarinet or oboe). However, the saxophone is almost universally made of brass. So, what is a "crack" on a brass instrument?