The trombone is a musical instrument in the brass family. Like all brass instruments, it is a lip-reed aerophone; sound is produced when the player’s buzzing lips (embouchure) cause the air column inside the instrument to vibrate. The trombone is
usually characterized by a telescopic slide with which the player
varies the length of the tube to change pitches, although the less
common valve trombone uses three valves similar to those on a trumpet.
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