Twenty years ago or more, the winners of a competition called Keltis Keltorai Eirann (I think that's right) performed at San Francisco's Irish Cultural Center and KPFA broadcast the whole show. It included over half an hour of 'solo singing without instruments'. The singing reminded me a lot of solo whistle music. On a couple of songs they bent the rules and had a clog dancer stepping in the background. A treat, a real treat! Don't miss a chance to hear it. It must have been Sean Nos, I guess.