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(from Latin cantus gemellus, "twin song"), medieval musical style of two-part polyphonic composition, possibly of popular origin, in which the voices move mainly in consecutive intervals of a third or a sixth. Crossing of parts is a common characteristic. Although gymel compositions have been preserved in manuscripts dating from the beginning of the 13th century, the name itself is first found in a detailed description of the style by the 15th-century theoretician Guilielmus Monachus.