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.
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) A part in great Highland Bagpipe music is a musical strain or sentence. Usually each part consists of four phrases, either one or two bars long. Several sentences combine to produce a paragraph or complete work or tune.
Codex Calixtinus (12th century) contains the earliest extant decipherable part music.
Part writing is derived from four-voice chorales written by J.S. Bach. The late baroque era composer wrote a total of 371 harmonized chorales. Today most students' reference Albert Riemenschneider's 1941 compilation of Bach chorales.
Part writing is a compositional technique that involves writing a piece of music for one or more parts.
Briefly, it [counterpoint], may be defined as Part-writing
. It has also been defined, happily, as 'the art of combining melodies
.'...By it [part-writing], here, is meant, the writing of successions of chords; and by Laws of Part-writing
, therefore, is meant, the principles which regulate the position
of chords, or distribution of parts
; the relation of part to part
, and the progression of individual parts
. In other wrods, laws of combination
, and laws of progression
, individual and simultaneous.
See also 
- ^ Van der Werf, Hendrik (1993). The Oldest Extant Part Music and the Origin of Western Polyphony, p.vii. H. van der Werf.
- ^ Starr, Eric (2009). The Everything Music Composition Book with CD, p.171. ISBN 978-1-60550-093-5.
- ^ Shepherd, John (2003). Continuum Encyclopedia of Popular Music of the World, p.257. ISBN 978-0-8264-6322-7.
- ^ Banister, Henry Charles (1887). Music, p.41&46. H. Holt and Company.