Radio 4 celebrates the limited talents of Joni Mitchell

Das Rheingold, Royal Opera House

Horrors wrestled into being

The Rhinegold, English National Opera, Coliseum

Politics and historical commentary aside, Lohengrin is currently on at Covent Garden

The ENO’s production of The Valkyrie may lack flames, but it is convincing nonetheless

Wagner’s sexual ambiguity spoke to Oscar Wilde, Aubrey Beardsley and Thomas Mann, says Norman Lebrecht