[1] He was also considered an outstanding interpreter of the title role in Massenet's opera Werther, and especially of its famous aria, "Pourquoi me réveiller?
After refining his technique singing Spanish zarzuela on stage in Madrid and Barcelona, Kraus made his professional opera debut in Cairo during 1956 as the Duke in Rigoletto, which became one of his signature roles.
In 1958, he sang Alfredo at the Teatro Nacional de São Carlos in Lisbon in a production of La traviata with Maria Callas, a live recording of which was later released.
In subsequent decades, Kraus extended his repertoire to include more Italian operas such as Lucrezia Borgia, La fille du régiment, Linda di Chamounix, Don Pasquale and La favorita by Donizetti; and French operas such as Roméo et Juliette, Les contes d'Hoffmann, Faust and Lakmé, while continuing to sing his hallmark roles of Werther and of Des Grieux in Manon.
In 1997, his home city of Las Palmas de Gran Canaria opened The Alfredo Kraus Auditorium in his honor.