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1) A part (or voice) is a strand or melody of music played by an individual instrument or voice (or group of identical instruments or voices) within a larger work. Parts may be referred to as an outer part (the top and bottom parts) or an inner part (those in between). Part-writing (or voice leading) is the composition of parts in consideration of harmony and counterpoint. In the context of polyphonic composition the term ''voice'' may be used instead of part to denote a single melodic line or textural layer. The term is generic, and is not meant to imply that the line should necessarily be vocal in character, instead referring to instrumentation or simply to register. Allen Forte defines a voice thus: ''Codex Calixtinus'' (12th century) contains the earliest extant decipherable part music.〔Van der Werf, Hendrik (1993). ''The Oldest Extant Part Music and the Origin of Western Polyphony'', p.vii. H. van der Werf.〕 2) Analogously, a part also refers to the separate printed or manuscript copies of the music for each individual instrument in an ensemble or orchestra, as distinct from the score, which holds the music for all the instruments. 3) In musical forms, a part may refer to a subdivision in the structure of a piece. This is for example the case in the widely used ternary form, usually schematized as A–B–A. In this form the first and third ''parts'' (A) are musically identical, or very nearly so, while the second ''part'' (B) in some way provides a contrast with them. In this meaning of ''part'', similar terms used are ''section'', ''strain'', or ''turn''. ==See also== * Cantus firmus 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Part (music)」の詳細全文を読む スポンサード リンク
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