- (1962) He performed Benjamin Britten's opera, "War Requiem" at his premiere.
- (1948) He made his opera debut playing Posa in Verdi's opera, "Don Carlos" at the Berlin's Stadtische Oper (now known as Deutsche Oper) where he was hired as principal lyric baritone.
- (1965) He began his American tour in New York City to sing Schubert's opera, "Winterreise," cycle without intermission.
- (1949) He toured the European countries.
- (Fall 1947) He gave his first professional lieder recital in Leipzig, Germany.
- (1947) He made his professional debut when he substituted for a baritone in Brahsm's "German Requiem."
- (1989) Author of his memoir, "Reverberations."
- (1988) He sang an all-Schumann program at Carnegie Hall in New York City.
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