You'd be surprised how difficult that actually is. Take the role of a DJ for instance - a good DJ will know what genre they're doing, play well know things from that genre but also introduce new music to keep it fresh. They might also step outside the genre a little - not too far so it's not dissonant with the rest of their set, but just far enough to give a break and a moment of "ah, that's nice/romantic/gnarly/metal/" for the listener.
It's a skill, and if you haven't got that ability to start with then you're unlikely to be able to give the correct prompts to create it. You might well get a lot of identical things, but a listenable varied set is more than that.