Aragall’s professional debut was at the Gran Teatro La Fenice, Venice, on 24 September 1963, in Verdi's opera Gerusalemme. The same year, he appeared at the Teatro alla Scala in Milan in L'amico Fritz by Pietro Mascagni, and signed a three-year contract with the theatre. In 1964 he performed at the Bavarian State Opera in Munich, and began performing in cities such as Berlin, Budapest, Venice, Genoa, Modena, Turin, Naples and Rome. In 1966 he received acclaim for his role singing Rodolfo in Puccini's La bohème at the Verona Arena and went on to sing this role in London's Covent Garden and the Metropolitan in 1968, at Buenos Aires's Teatro Colón in 1970 and in San Francisco in 1973. Rodolfo became one of his most frequently performed roles. In 1966, Aragall sang Romeo in Bellini’s I Capuleti e i Montecchi at La Scala with Renata Scotto and Luciano Pavarotti.
