Edited sentence: Although many tenors have sung Parsifal to acclaim (though none perhaps as well as Melchior), Martha Mödl, who sang Kundry at every Bayreuth production from 1951-9, became associated with the role the way Callas is associated with Vincenzo Bellini's Norma (opera).Although she never recorded the role in the studio, fully ten of her live recordings exist, most notably the '51 Knappertsbusch mentioned above and a 1953 recording with Clemens Krauss.The role, which is lower than the rest of Wagner's mature heroines, suited Mödl's natural high mezzo voice, and her intensity of characterization has made her interpretations definitive