Musical composition is:

• an original piece of music
• the structure of a musical piece
• the process of creating a new piece of music

Musical compositions

A piece of music exists in the form of a written composition in musical notation or as a single acoustic event (a live performance or recorded track). If composed before being performed, music can be performed from memory, through written musical notation, or through a combination of both. Compositions comprise musical elements, which vary widely from person to person and between cultures. Improvisation is the act of composing during the performance, assembling musical elements spontaneously.

Composition as musical form

main: Musical form

In discussing the structure or organization of a musical work, the composition of that work is generally called its musical form. These techniques draw a parallel to art's formal elements. Sometimes, the entire form of a piece is through-composed, meaning that each part is different, with no repetition of sections; other forms include strophic, rondo, verse-chorus, or other parts. Some pieces are composed around a set scale, where the compositional technique might be considered the usage of a particular scale. Others are composed during performance (see improvisation), where a variety of techniques are also sometimes used.Some are used from particular songs which are familiar.

Important in tonal musical composition is the scale for the notes used, including the mode and tonic note. In music using twelve tone techniques, the tone row is even more comprehensive a factor than a scale. Similarly, music of the Middle East employs compositions that are rigidly based on a specific mode (maqam) often within improvisational contexts, as does Indian classical music in both the Hindustani and the Carnatic systems, gamelans of Java and Bali, and much music in Africa.

Composing music

People who practice composition are called composers. Compositional techniques are the methods used to create music. Useful skills in composition include writing musical notation, instrumentation, and handling musical ensembles (orchestration). Other skills include extended techniques such as improvisation, musical montage, preparing instruments, using non-traditional instruments, and other methods of sound production.

Compositional instrumentation

main: Arrangement (music)

The task of adapting a composition for musical instruments/ensembles, called arranging or orchestrating, may be undertaken by the composer or separately by an arranger based on the composer's core composition. A composition may have multiple arrangements based on such factors as intended audience type and breadth, musical genre or stylistic treatment, recorded or live performance considerations, available musicians and instruments, commercial goals and economic constraints.