Composer

[Tina]

One who composes; an author. Specifically, an author of a
piece of music.

[Couch Potatoe]

[One] who creates [music].

[Ernesto]

someone who can party all night, smoke two packs a day, drink through a [6 pack], sleep for 20 hours, and then [scribble] on a pad of staff paper for five minutes and call it a [hard days] work.

[PussyCat]

A person who writes music, especially as a professional occupation.