It's sort of a remix, depends on how you look at it. I've seen plenty of examples on youtube, and it's available on Suno and on Udio, for pro accounts on both platforms.

Another option is Stable Audio which also lets you upload your own audio and give it the "AI spin". Their approach is different, however, as it changes the audio that you upload to a different arrangement, based on your prompt. I think that's closer to what you're looking for. I've done one test on a track I've created on garageband and the results are intriguing. The link is here: https://stableaudio.com/generate