Earlier today the Glyndebourne Festival enchanted and unsettled a worldwide Internet audience with a high-quality video stream of its essentially flawless production of Britten's Turn of the Screw, with Jonathan Kent directing and Jakub Hrůša conducting. How big an audience? It would be interesting to know — for a little while the topic #turnofthescrew was trending worldwide on Twitter, for whatever that's worth. The stream will be archived on the Glyndebourne site until Sept. 12.... Radiohead are getting ready to perform songs from their latest album, The King of Limbs. I can't wait to see them next month.... The pianist Taka Kigawa plays one of his patented hardcore-modern programs at (Le) Poisson Rouge tomorrow night: Boulez's Second Sonata, Saariaho's Ballade, Prelude, and Stockhausen's Klavierstück X... On August 29th, the Vienna Music Film Festival will take over the big outdoor screen in Brooklyn Bridge Park with HD footage of various opera stars in performance, including Jonas Kaufmann singing Lohengrin, Anna Netrebko singing Carmen, and Renée Fleming singing Korngold.... The music of the late Ann Southam is prospering quietly on CD: newly arrived are discs of Glass Houses Revisited, on Centrediscs, with Christina Petrowska Quilico at the piano; and Soundings for a New Piano, from Irritable Hedgehog, with R. Andrew Lee.