Sam - I'm a bit busy at the moment, but I'll get back to this later today.

Briefly: some of the recordings are commercial releases and we can probably get audio for some or all of those from people here. As far as permissions to use them, many were released by specialist folk labels and I imagine they might be happy to let your respected institution used them. Some are research outfits and they may also be willing to let you used their recordings (or link to them) eg Max Hunter, LOC. Some (eg Hartness, Fowke, Warner) are held by universities and not (currently) publicly available, but again they may well be willing to supply you with copies. (There may be some that I didn't catch too; eg Death of Parker, I'm sure is available)

As for the ones without audio, the fall into two groups, as per my lists above. The first list (those with Roud number above) generally have other versions available and I'll see which have tunes (probably most, but some will have only text). The second list is those with only a tune specified and I need to check those tune names against the list of tunes in a standard reference (Simpson: The British Broadside Ballad and its Music) to see which are known with music. If you want some of the songs sung to any of these tunes, there are probably people on here happy to do them and you can take your pick!

I'll get back to you on both of these, probably later today.

Mick