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Well-formed rhythms (aka MOS) contain two beat sizes arranged to make the rhythm as even as possible. Each such rhythm has a higher-level rhythm that splits the original beats into two new sizes. This allows for a complex nested hierarchy of rhythms to be created. Well-formed rhythms are a superset of Euclidean rhythms. For example, they also include rhythms with no regular pulse. The mathematics and musical implications are discussed in our Computer Music Journal article:
