1) march of the metronomes
Wahohoho (sorry, just listened to The Fox)! Schooling has the same effect, sometimes.
2) music theory, as presented by möbius strip
George Hart writes: "The connections between mathematics and music are many. For example, the differential equations of vibrating strings and surfaces help us understand harmonics and tuning systems, rhythms analysis tells us the ways a measure can be divided into beats, and the study of symmetry relates to the translations in time and pitch that occur in a fugue or canon."
3) dancing sand
An experiment very much worth its salt.