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In music, perpetuum mobile (English pronunciation /pərˌpɛtjʊəm ˈmoʊbɪleɪ/, /ˈmoʊbɪli/; literally, "perpetual motion"), moto perpetuo (Italian), mouvement perpétuel (French), movimento perpétuo (Portuguese) movimiento perpetuo (Spanish), is a term used to describe a rapidly executed and persistently maintained figuration, usually of notes of equal length. Over time it has taken on two distinct applications: first, as describing entire musical compositions or passages within them that are characterised by a continuous stream of notes, usually but not always at a rapid tempo; and second, as describing entire compositions, or extended passages within them that are meant to be played in a repetitious fashion, often an indefinite number of times.[1]
- ^ Apel, Willi, ed.; Harvard Dictionary of Music, 12th ed.; Harvard University Press; Cambridge, Mass.: 1960. p. 560