Stephanie Hughes with music and arts news, including a review of Gavin Bryars's new opera Dr Ox's Experiment, which opened last night at English National Opera. Music includes Mozart's Der Vogelfanger from Die Zauberflote sung by Thomas Allen at 6.05; the collaborative work Variations on Sellinger's Round played by the Guildhall String Ensemble at 7.05; and Wagner's Forest Murmurs from Siegfried played by the New York Metropolitan Opera Orchestra, conductor James Levine , after the news at 8.00.