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| | Trombone - Facts from the Encyclopedia - Yahoo! Education (Site not responding. Last check: ) |
 | | In the enlarged orchestra of the 19th cent., the trombone became increasingly important, being valued for its wide range in pitch and dynamics. |
 | | Three trombones are standard in the orchestra, formerly alto, tenor, and bass. |
 | | A valved trombone, first produced in Vienna in the 1820s, is frequently used in Latin countries, and by some jazz musicians, but is inferior in tone quality to the slide trombone. |
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