It's not a user-facing product, it's a building block that would be useful to train music-oriented neural network, be they diffusers or other types of models.

It's probably going to take a little while before we see new models that leverage this library.

If you're looking for "stable diffusion but for music" right now, you could look at Riffusion (https://huggingface.co/riffusion/riffusion-model-v1)