1. One who composes; an author. Specifically, an author of a piece of music.
If the thoughts of such authors have nothing in them, they at least . . . show an honest industry and a good intention in the composer. --Addison.
His [Mozart's] most brilliant and solid glory is founded upon his talents as a composer. --Moore (Encyc. of Mus.).
2. One who, or that which, quiets or calms; one who adjusts a difference.
Sweet composers of the pensive soul. --Gay.
n : someone who composes music as a profession