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The trombone has a slide that can be moved to change the pitch of notes rather than valves or keys that lengthen the tubing to change the pitch of notes like other brass instruments. And there are a lot more than 3 other brass instruments.
Brass instruments produce sound by the vibrating of the player's embouchure in a mouthpiece, and the valves and slides on the instrument alter the length of the tubing in the instrument which affects the pitch of the notes produced. The farther the air has to travel in the instrument the lower the pitch of the sound is, whereas the less distance the air has to travel the higher the pitch the instrument will produce.
Brass instruments have a brassy timbre due to the size of the bore (the hole), and how much emphasis is being put in to playing the instrument in order to generate the noise quality from the instrument.
Unlike the rest of the brass family, trombones change notes by moving a slide instead of using valves.
Brass instruments can have valves or a slide, but not reeds. Brass instruments create sound by the vibrating of the player's embouchure in a mouthpiece, and the valves and slides on the instrument change the length of the tubing in the instrument which affects the pitch of the notes produced. Reeds are used in woodwind instruments to vibrate to produce a sound instead of using a mouthpiece like in brass instruments.