The career of Helga Dernesch has unfolded in four distinct segments: mezzo soprano, lyric soprano, dramatic soprano, and, once again, mezzo. During the middle two phases, the comely soprano was encouraged by Herbert von Karajan to undertake the heaviest Wagner soprano roles, assignments really beyond the means of a singer whose vocal weight was well below that of a Nilsson or Varnay. Eventually, she was forced to agonize over a return to the mezzo range. Once the transition was made, she was able to employ her still handsome voice and extend her career into her mid-sixties. Fo...