The Bavarian soprano usually covers mainstream opera from Mozart to Strauss with a dash of big Italian roles. Here, she dips into operetta, but with a personal twist. Aside from a handful of Johann Strauss, Lehar and Kalman, she sings mid-20th century Broadway rep, some in English, some in German. To my ears, My Fair Lady is much improved auf Deutsch (and with a burglar-scaring squeak), though Sweeney Todd stumbles a bit and Ms D does Andrew Lloyd Webber a favour by choosing Queen’s English for an aria from Phantom of the Aria, perhaps the most musical rendition it has ever received. David Charles Abell conducts the Royal Liverpool Philharmonic in top-notch sound and the only regret is the superfluous, expensive inclusion of a brittle-voiced Rolando Villazon in the Merry Widow duet.