Other great "modern" ballad singers (just a few): Martin Carthy, Martin Simpson, Jean Redpath, June Tabor, Frankie Armstrong, Isla St. Clair, Archie Fisher, Ewan MacColl, A. L. Lloyd. The last two pretty much started the British "ballad revival" of the 1950s.

For straight-out traditional performers, you can't beat Jeannie Robertson, John Strachan (both Scottish) and Jean Ritchie (American).

For some great "trad rock," try Steeleye Span (especially pre-1980 recordings) and Fairport Convention (especially when Dave Swarbrick was fiddler).