Finest Kind, consisting of Ian Robb, Ann Downey, and Shelley Posen. Superb. Incomparable. (I don't use superlatives indiscriminately.) They draw on different areas: Ian from English trad., Ann from cowboy and Western material, and Shelley, a musicologist by trade, finds forgotten old songs and brings them back to life. (See his "Old Songs Home," printed a couple of years ago in Sing Out!) They sometimes use instruments, but their a capella work is the best, I think.