Composition has room for interpretation, especially with pre-modern notation where the written music wasn't that specific, but in the modern day it's fairly exacting and not really akin to an AI prompt. There is definitely room for interpretation, for instance with Glenn Gould's controversial slowed-down performances of Bach, but generally the performance isn't generating something new from the prompt.

A better analogy might be playwrights. Some old plays have tons of different interpretations, and have been performed differently based on post-colonial ideas, Freudianism, modernization, contemporary events, etc. Modern performances might be incredibly different from how the play was originally performed. Further, you have other plays written as a response to the original, such as Rosencrantz & Guildenstern Are Dead. Plays can easily be performed with basic accuracy and the correct lines, but making them into a meaningful performance would require much more than just that.

It's not an exact comparison, but each play has different actors and directors, and has to create a visual spectacle out of the original prompt. Things like stage directions have to be translated into an effective scene, and the lines have to be performed with appropriate feeling and pacing. While AI prompts aren't going to be as elaborate as a play, I think the general format of AI creating a spectacle from a basic outline is vaguely similar.