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Directly behind the rim is the cup, which channels the air into a much smaller opening (the back bore or shank) that tapers out slightly to match the diameter of the trumpet's lead pipe.The dimensions of these parts of the mouthpiece affect the timbre or quality of sound, the ease of playability, and player comfort.
(a transposing instrument), having a tubing length of about 1.48 m (4 ft 10 in).
Generally, the wider and deeper the cup, the darker the sound and timbre.
Modern trumpets have three (or, infrequently, four) piston valves, each of which increases the length of tubing when engaged, thereby lowering the pitch.
The trumpet group contains the instruments with the highest register in the brass family.
Trumpet-like instruments have historically been used as signaling devices in battle or hunting, with examples dating back to at least 1500 BC; they began to be used as musical instruments only in the late 14th or early 15th century.