The full title is actually Yan Tan Tethera, referencing an archaic counting system (and while I'm in pedant mode: the composer's name is Birtwistle).
I can tell you more *facts* about it (mostly by paraphrasing from Michael Hall's books on the composer), but I've never actually heard it. Only one production of it, as far as I know. It was recorded and later broadcast by BBC television, but no recording is available. Which is a shame, what I've read about it fascinates me...
― Paul in Santa Cruz (Paul in Santa Cruz), Tuesday, 2 March 2004 18:36 (twenty-one years ago)