He has appeared with the company every season since 1968–1969. He made his debut at the Vienna State Opera in 1967; at the Lyric Opera of Chicago in 1968; at both La Scala and San Francisco Opera in 1969; at Arena di Verona on July 16, 1969 as Calaf (his first) in Turandot with Birgit Nilsson; at the Philadelphia Lyric Opera Company in 1970; and at Covent Garden in 1971. In 1975, Domingo debuted at the prestigious Salzburg festival, singing the title role in "Don Carlo" in an all-star cast with Nicolai Ghiaurov, Piero Cappuccilli, Mirella Freni and Christa Ludwig with Herbert von Karajan conducting. Thereafter Domingo frequently returned to Salzburg for a number of operas, as well as for several concert performances. He has now sung at practically every important opera house and festival worldwide. Domingo first sang Mario Cavaradossi in Puccini's "Tosca" in a 1961 performance in Mexico City. He sang Cavaradossi at the Met on February 15, 1969 with Birgit Nilsson (broadcast). 1971 he made his Covent Garden debut in the role. He continued to sing the part for many years, especially at the Met and in Vienna, eventually performing it more than any other of his roles. In September 1975, Domingo debuted in the title role of Verdi's "Otello" at the Hamburg State Opera. It soon became his signature role and one of operas he performed most frequently (over 200 times). He recorded the part three times in the studio and appeared in four officially released filmed versions of the opera. Oscar-winning Shakespearean actor, Laurence Olivier, declared after seeing the tenor in the role: "Domingo plays Othello as well as I do "and" he has that voice." Domingo has also conducted operas and occasionally symphony orchestras as well. On 7 October 1973 he conducted his first opera performance, "La traviata" starring Patricia Brooks at the New York City Opera. The same year he released his debut album as a conductor, "Domingo Conducts Milnes/Milnes Conducts Domingo", with baritone Sherrill Milnes. Domingo increasingly began to appear as a conductor at major opera houses around the world. In late 1983, he led a performance of Johan Strauss's "Die Fledermaus" at Covent Garden, which was televised.