If you're focusing on the *creation* aspect:
* Performer: Someone who interprets and presents existing music.
* Interpreter: Similar to performer, but emphasizes the analytical and artistic understanding of the music.
* Consumer: Someone who passively experiences music without actively creating or performing it.
If you're focusing on the *musical form* aspect:
* Lyricist: Someone who writes words for songs, but not the music.
* Arranger: Someone who adapts existing music for a different format or instrumentation.
If you're focusing on the *role* aspect:
* Critic: Someone who analyzes and evaluates music.
* Listener: Someone who passively experiences music without creating or performing it.
The best antonym will depend on the specific context of your sentence.