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SOUND FROM BRASS-TROMBONE

The Trombone Is A Musical Instrument In The Brass Family. Like All Brass Instruments, Sound Is Produced When The Player's Vibrating Lips Cause The Air Column Inside The Instrument To Vibrate. Until The Early 18th Century The Instrument Was Called A Sack-but. Since The Trombone Has  The Capability To Make All Its Pitches In Tune, It Is Somethings Called The Perfect Instrument .
Nearly All Trombones Have a Telescopic Slide Mechanism That Varies The Length Of The Instrument To Change The Pitch. Many Modern Trombone Models Also Utilize a Rotatory Valve As a Means To Lower The Pitch Of The Instrument.

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