A composer is someone who creates original music by combining melodies, harmonies, and rhythms into a complete piece. While a songwriter might focus on lyrics and simple tunes, a composer typically writes more complex music, often for orchestras, choirs, or other large groups of musicians.

Wolfgang Amadeus Mozart, Ludwig van Beethoven, and Johann Sebastian Bach were famous composers who wrote symphonies, concertos, and operas that orchestras still perform today, centuries later. Modern composers like John Williams create powerful film scores: when you hear the thrilling Star Wars theme or the suspenseful Jaws music, you're hearing a composer's work.

Composing requires understanding how different instruments sound together and how to express emotions through music. A composer might spend weeks or months crafting a single symphony, carefully deciding whether the violins should play softly or loudly at each moment, when the trumpets should join in, and how to build toward an exciting climax.

The verb form is compose. When someone composes music, they're inventing something entirely new, creating original melodies, harmonies, and rhythms that no one has heard before. It's like an author writing an original story rather than reading someone else's book.