Growling (wind instruments)
The growl gives the performer's sound a dark, guttural, gritty timbre resulting largely from the rustle noise and desirable consonance and dissonance effects produced.A woodwind growl can also be produced by allowing air to escape from around the corners of the mouth, causing a vibration in the lips and mouthpiece.The performer selects a bizarre or unusual fingering that causes the instrument to attempt to sound on multiple notes.A "growl trombone" may be seen in a 1929 film Black and Tan Fantasy played by Joe "Tricky Sam" Nanton.Harmonica players have started growling as well by using a technique similar to bending notes which causes the reeds to project a raspy guttural sound.