The Internet Archive mirrors a subset of the collection here: https://archive.org/details/freemusicarchive

IIRC this is a point in time snapshot from some years back, but likely sanitized of any tracks that may have more restrictive licenses.

Not all, there is some CC-BY and CC-BY-SA in there. I think you can search by license type, at least you used to be able to. Not aware of any bulk download.