Editing Resonator (section)

=== Percussion instruments ===

In many [[keyboard percussion]] instruments, below the centre of each note is a tube, which is an [[Acoustic resonance|acoustic cavity resonator]]. The length of the tube varies according to the pitch of the note, with higher notes having shorter resonators. The tube is open at the top end and closed at the bottom end, creating a column of air that [[resonance|resonates]] when the note is struck. This adds depth and volume to the note. In string instruments, the body of the instrument is a resonator. The [[tremolo]] effect of a [[vibraphone]] is achieved via a mechanism that opens and shuts the resonators.