This is incredibly good compared to SOTA music models (MusicGen, MusicLM). It looks like there's also a product page where you can subscribe to use it, similar to Midjourney: https://www.stableaudio.com/

Sadly it's not open-weight and it doesn't look like there's an API (again like Midjourney): you subscribe monthly to generate audio in their UI, rather than having something developers can integrate or wrap.