Karajan did not record the opera officially until 1971–72. Karajan's selection of a lighter soprano voice (Helga Dernesch) as Isolde, paired with an extremely intense Jon Vickers and the unusual balance between orchestra and singers favoured by Karajan was controversial. In the 1980s recordings by conductors such as Carlos Kleiber, Reginald Goodall and Leonard Bernstein were mostly considered to be important for the interpretation of the conductor, rather than that of the lead performers. The set by Kleiber is notable as Isolde was sung by the famous Mozartian soprano Margaret Price, who never sang the role of Isolde on stage. The same is true for Plácido Domingo, who sang the role of Tristan to critical acclaim in the 2005 EMI release under the baton of Antonio Pappano despite never having sung the role on stage. In the last ten years acclaimed sets include a studio recording with the Berlin Philharmonic by Daniel Barenboim and a live set from the Vienna Staatsoper led by Christian Thielemann.