The French horn is an orchestral brass transposing instrument, developed from the huntinghorn. It consists of a coiled tube with a wide bell and a cup-shaped mouthpiece. In the 18th century crooks of tubing were inserted to enable it to change a key. In the 19th century valves were fitted giving the horn in F a complete range of about three octaves above B below the bass stave. Research French Horn
 
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