Theremin's Harmonic Rhythmicon
Sometimes called the first ever "drum machine" (though not really one in the modern sense), Theremin's rhythmicon combines polyrhythms with pitches from the harmonic series. It's based on ideas and work by the composers Charles Seeger and Henry Cowell.
The beats tempi are in the same relationships as the pitch frequencies, so e.g. the pitch at 2/1 (double the 1/1/ frequency) plays beats at double the tempo of the 1/1, the 3/1 plays at three times its tempo and so on.
So everything played on this instrument sounds harmonious.
Play all these videos one after another
Use these videos as a resource
You can use any of these videos as a resource for your own website or wikis, or make more of them yourself - see Add videos like these to your own site
Play the harmonic rhythmicon in Bounce Metronome
You can use Bounce Metronome Pro to play the harmonic rhythmicon shown in these clips. To find out more see Play Theremin's Rhythmicon with Bounce Metronome Pro.
Composition using the Rhythmicon
The Computer Polyrhythmicon web site includes Example compositions using the computer rhythmicon and a RESOURCES page with many more links