Crook

Crook (Fr.: allonge, bocal, cuivrette, ton de rechange; Ger.: Stimmbogen, Krummbügel, Ess, S-Rohr; It.: ritorto, pompa, crometta), 1. an S-shaped tube that carries the mouthpiece of a bassoon, etc., or other removable tube carrying a reed; 2. detachable piece of tubing applied to a brass instr. in order to change its pitch, introduced ca. 1718. See also: Einsatzbogen, Setzstück, shank.