Bore (wind instruments)
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In music, the bore of a wind instrument is its interior chamber. This defines a flow path through which air travels, which is set into vibration to produce sounds. The shape of the bore has a strong influence on the instrument's timbre.
Image: Cornet Bb large
Brass instrument
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A brass instrument is a musical instrument that produces sound by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips. Brass instruments are also called labrosones or labrophones, from Latin and Greek elements meaning 'lip' and 'sound'.
Six high brass instruments Left, from top: A reproduction baroque trumpet in D, a modern trumpet in B♭, a modern trumpet in D, a piccolo trumpet in B♭ (octave higher), and a flugelhorn in B♭. Right: a cornet in B♭.
A tenor horn (alto horn) in E♭, baritone horn in B♭, and euphonium in B♭
Brass instrument piston valves
Flugelhorn with three pistons and a trigger