While Heppner considers himself fundamentally a lyric tenor, he has become an eminent Wagnerian, and his Tristan has been hailed as a worthy successor to Lauritz Melchior's. Even after his "second debut" in Wagnerian roles, he still sang the title roles of Mozart's Idomeneo and La clemenza di Tito, complete with ornamentation, and added not only lieder, but popular parlor songs to his recital repertoire. His operatic repertoire also includes Verdi, Massenet, and Puccini, and he is a noted Peter Grimes. While his voice is not as large as that of some of the heldentenors, it has...