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Word of the day

treble shift

A mechanical device on an accordion that directs air from the bellows through additional reeds to create a different tone quality of the melody notes. There are typically four sets of treble shifts, one set tuned in unison, a second set tuned one octave higher, a third tuned one octave lower, and the fourth set, the tremulant,tuned slightly higher than unison. A universal system of labels has been given to these treble shifts for the composer to designate specific sounds.'
 

See the table of treble shift and labels in the Appendix.