The trombone is developed from the medieval sackbut, an instrument which it still very much resembles. The trombone is a member of the trumpet family. Without valves, it reaches a range of notes by means of a slide that alters the length of the tube.

A larger mouthpiece gives it a more solemn sound than its brass companions, and it has a wide power range, able to play very softly and very loudly with equal precision.

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