I'll try Ticklish Ghetto (off Culture's "Trod On" album and one of my very favourite "Roots" tracks) on the 5 string then shall I? That should ruin it! I think you're right though, there are some reggae songs that would work brilliantly as folky songs.

Going back to the original theme. I've got another On-U sound album called "Barmy Army" which is football terrace chants and songs (recorded "live" at football grounds) given the dub treatment. I have heard it said that football chants are the only remaining Traditional songs....... maybe this would meet the OPs spec? (Unfortunately it's not as good as it could have been though).

Tackhead were never my favourite On-U incarnation...... much preferred Dub Syndicate, the afore mentioned African Headcharge and Gary Clail did a great album with them. Can anyone remember the name of the mad Scotsman who lived in a horse box and insisted on carrying a long sword (and wearing a kilt) wherever he went? He did at least one album with On-U and I think had a hit(ish) single.