The resonance of woodwind instruments can be modeled after a closed cylindrical pipe and calculated by the equation `f = (nv)/(4L)` where n denotes the number of harmonics, `v` the velocity of sound propagating in air, and `L` the length of the pipe. For a trumpet that has tube length of about 1.4m, the resonating frequencies would be: f = (nv)/(4L) = (343n)/(4*1.4) = 61.3n = 61Hz, 184Hz, 306Hz, 429Hz... The sound of a trumpet ranges from `[email protected]` up to `[email protected]`. I tried as hard as I can vibrating (buzzing) my lips but I can hardly get my mouth to vibrate more than perhaps few tens Hz without getting sore. It's hard to believe, even with practice, that a person can possibly vibrate his lips hundreds of Hertz let alone over a 1000Hz (or do they?). Do woodwind instrument players really vibrate their lips as quick as the pipe resonates?