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perpetuum mobile
In music ''perpetuum mobile'' (Latin, English pronunciation /pəːˌpɛtjʊəm ˈməʊbɪleɪ, ˈməʊbɪli), ''moto perpetuo'' (Italian), ''mouvement perpétuel'' (French), 'movimento perpétuo' (Portuguese) ''movimiento perpetuo'' (Spanish), literally meaning "perpetual motion", has two distinct meanings: pieces of music, or parts of pieces, characterised by a continuous steady stream of notes, usually at a rapid tempo, or whole pieces, or large parts of pieces, which are to be played repeatedly, often an indefinite number of times.
==As separate compositions==
As a separate piece, a "Perpetuum Mobile" can be defined as a composition where (a large part of) the piece is intended to be repeated an (often not specified) number of times, without the "motion" of the melody being halted when a repeat begins. Canons are often intended to be performed in a ''moto perpetuo'' fashion (which, in that case, can be called ''canon perpetuus'').
In some cases the repeats of a "perpetuum mobile" piece are at a different pitch (while a modulation or a chord progression occurs during the repeatable part): some of the ''riddle canons'' of Bach's Das Musikalische Opfer are examples of this particular kind of Perpetuum Mobile/Canon Perpetuus.
''Perpetuum mobile'' as a genre of separate musical compositions was at the height of its popularity by the end of the 19th century. Such pieces would often be performed as virtuoso encores, in some cases increasing the tempo along the repeats.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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