For each loop, you can control both the number of subdivisions (the number of onsets) in each loop and the length (duration) of each subdivision. With these two definitions in mind, let’s take a look at the Groove Pizzeria interface. In Western music, you mostly see polymeter over short time spans in the form of hemiola or syncopation. This is much more common in Western music than polyrhythm. The onsets in each loop have the same duration, but each loop has a different number of onsets. Polymeter is two or more concurrent loops of different duration.In Western music, polyrhythms usually only occur for short time spans in the form of tuplets, but in West African drumming, polyrhythms are a core structural feature. When people talk about 4:3 or 5:2 polyrhythm, this is what they mean. Finally, t he ratio of the number of onsets in each loop is not a whole number (otherwise one loop would just be an even subdivision of the other). T he loops contain different numbers of onsets, meaning that the subdivisions of each loop are not same length. Each loop consists of a set of evenly-spaced subdivisions or rhythmic onsets. Polyrhythm is two or more concurrent loops of equal duration.Tyler’s thesis contains the clearest definition of the terms that I know of, which I paraphrase here. The words “polyrhythm” and “polymeter” are frequently used interchangeably, but they are not the same thing. This means that you can use the Groove Pizzeria to make polyrhythm and polymeter. The Groove Pizzeria gives you two sets of concentric rhythm necklaces, each of which can have its own time duration and subdivisions. The Groove Pizza is a set of three concentric rhythm necklaces, each of which controls one drum sound, e.g. Like the Groove Pizza, the Groove Pizzeria is based on the idea of the rhythm necklace, a circular representation of musical rhythm. You can record the Groove Pizzeria’s output using Audio Hijack, however. As of this writing, there are no presets, no saving, no exporting of audio or MIDI, and no changing drum kits. Note that the Groove Pizzeria is still a prototype, and it doesn’t yet have the full feature set that the Groove Pizza does. For his NYU music technology masters thesis, Tyler Bisson created a web app called Groove Pizzeria, a polyrhythmic/polymetric extension of the Groove Pizza.
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