The lyrics on those songs are basically a pastiche of everything popular. But just based on sound it's pretty convincing. I bet you could train a generative AI to push out trance bangers as long as they don't have any lyrics.
I mean the user wrote the lyrics (or maybe ChatGPT lol). People of course write more interesting ones (Just found a Ukrainian about Kyiv: https://sonauto.ai/songs/xRDqe57ZgT6QrFXiIzF0). There was another one about Frank Sinatra being attacked with a baseball bat but I can't find it rn.
audio quality is still WIP and UI is ugly but prompting should allow more detail.
e.g., 70s Dolly Parton-style song rando made earlier today: https://sonauto.ai/songs/t4XGcHqsYwS6B73MjtV5