http://uk.reuters.com/article/scienceNews/idUKN0849665920080208

Jazz legend John Coltrane routinely pushed his tenor saxophone into the altissimo range, notes far above the instrument's normal range, and now Australian scientists know how he did it.

Physicists at the University of New South Wales in Sydney said professional saxophone players can tune their vocal tract -- the tube formed by the lips, mouth, tongue, throat and vocal folds or cords -- to produce those extremely high notes.