Perpetuum mobile

In music, ''perpetuum mobile'' (English pronunciation /pərˌpɛtjʊəm ˈmoʊbɪleɪ/, /ˈmoʊbɪli/; Latin, 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. Provided by Wikipedia