A composer is a person who has written the music for a song or work.

A composer is the originator of the musical material and is responsible for creating the melodies, harmonies and structures of the song.
A composer plays a central role in the creation of a musical composition. Through their creative work, they shape the musical elements into unique and expressive music. A composer may work alone or in collaboration with others. A song or work may have been composed by a single composer or by several people working together.

A composer owns the copyright in a musical composition. This means that he or she has the right to decide on the use, publication and distribution of the work. He or she may also receive remuneration when the music is publicly performed, broadcast or licensed.