"The composer is not me."
Translation:Nem én vagyok a zeneszerző.
There actually isn't an -erző suffix. Here's how the word is formed:
- zene = music
- szerző = author, writer, composer
You'll see that szerző can also translate to composer, but unlike zeneszerző the word isn't limited to composers of music; it instead refers to composers of any type of work.
I'm not a native speaker, though, so perhaps I'm wrong about the last part. This guess is just based on the other translations. ^_^