The resonance frequencies of an open pipe are harmonics of the fundamental frequency:fn=nf1. Each of these resonances can be excited by sound pulses occurring at themth submultiple of the resonance frequencyfn/m=n/mf1. These lead to a large number of “privileged frequencies” at which a woodwind reed or the brass player's lips can “lock in” to a wind instrument bore [A. H. Benade,Horns, Strings&Harmony(Doubleday, Garden City, NY, 1960), pp. 166–170]. Resonances and privileged frequencies of a 60‐cm pipe will be demonstrated with simple apparatus.