Having given up on the ROH (or vice versa), Bjork will now be appearing at the Coliseum, home of English National Opera, on September 23, backed by a harpist and a 15-piece Eskimo choir. What classical music fans might be expected to make of the contribution of the other principal musicians in her small band, namely ultra-hip electronic San Franciscan duo Matmos, is anyone's guess. But by the time Bjork starts whispering the intensely sexual lyrics of Cocoon (her forthcoming single), while gasping in pseudo-orgasmic bliss over washes of subsonic synthesizer and clicking micro-beats, it's safe to assume that nobody is going to think they are at the Proms.