I had a whole list - then I remembered the specification of "a capella," so I chucked a lot of them, which I think, like some of Rick F's, really sound a whole lot better with guitars, banjos, etc., behind them to help keep the strong rhythm.

(I'm trying to 'hear' "Sing With The Angels" as an a capella group song, and I keep 'hearing' it dragging.)

Wild Mountain Thyme, though, would sound good a capella, I think.