The natural vibrations of strings, flutes and cantilevers are discussed further here. Some visual examples of turbulent flow as well as discussion of a flute edge tone is collected here. Fourier spectra of a human voice singing are presented here. Sonagrams of a human voice in air and helium may be seen here. Compare to the sonagram of a narwhale song here.
And now (especially for Eric) some draft images of the physical basis for musical scales. The diagram shows four polar plots of the first few harmonics of vibration for various sound sources. The 2*pi cycle is based on the octave (frequency ratio of 2). The spiralling polygonal grid divides the octave into 12 (Bach's equal temperament) or 7 (Chopi & Burmese 'classical' theory) equal intervals in logarithmic units. Unison is at 12 o'clock, with increasing frequency in a clockwise direction.
Physics & biophysics students at UWA can access the Igor program used in this analysis at
Course Work / 3rd Year / OctavoPlots4