It's a difficult question to answer, "why do you like the things that you like?"
There is surprise that can be had at the generation phase. Sometimes I've got a particular detailed thing in mind that I'd like to hear about, I can end up writing pages of prompts, hand-tweaking the lyrics extensively, and regenerating bits until it's just right. Other times I'll throw out a very general vibe and just see what the AI comes up with. Some of my favourites are songs that definitely surprised me.
I'm actually not very familiar with the specific ways of describing the sound of different styles of songs - pop-rock, folk ballad, driving bass lines, all those sorts of descriptive terms are lost on me. So I usually let the AI come up with something for that based on a more general vibe, like I tell it a song should be "upbeat" and "informative" and it'll come up with something. I get to hear a lot of variety that way.
Would you like me to link specific examples? Honestly I was expecting more of an "AI sucks and you suck" kind of response but I guess there's enough responses to this post that I haven't been noticed in among them all, so I could show you a playlist or a few specific tracks that show the kind of music that I enjoy that I don't think I'd have ever been able to find in significant quantities from "traditional" music sources.