Major part creating music with the help of A.I. is coming up with the prompts describing what kind of music you want. Usually this is just listing combinations of different music genres and hoping they mix together in a way you hope.
Some combinations are pretty obvious, but if you really want to generate some unique sounds you need to put a bit of effort trying out some unconventional combinations. While there isn't much control on how strongly each individual genre comes across, especially if you use more than a few, it often requires many tries to get what you want.
It's all about experimentation. Sometimes you get what you expected, other times it sounds nothing you would have hoped for. But sometimes two genres can mix together with quite unexpected results. Some of my best songs have been results of such experimentation.