musical composition

Musical composition is a phrase used in a number of contexts, the most commonly used being a piece of music. It is also used, however, to refer the structure of a musical piece and to the process of creating or orchestrating a new piece of music.
See more at Wikipedia.org...

Noun
1. a musical work that has been created; "the composition is written in four movements"
(synonym) opus, composition, piece, piece of music
(hypernym) music
(hyponym) morceau
(part-meronym) finale, coda