This is an onomatopoeia used to convey the manner in which a concert
band should not begin a piece of
music.
This sound is typically produced when the musician(s) is not prepared to play, did not breathe in an effective fashion, or is not using
air that is fast enough to develop an acceptable tone for his/her instrument.
Band Director: "I don't want to hear the trumpets make an entry
like that again. Articulate and be ready to
play. I want to hear a clean '
ta' not a 'bmrahw.'"