Anton Haizinger heard Haizinger sing in concerts, and offered him an engagement at the theatre; Haizinger gave up teaching. Haizinger's first roles at Theater an der Wien, in 1821, were in two operas by Rossini, as Gianetto in "La gazza ladra" and Lindoro in "L'italiana in Algeri". He soon became well-known in Vienna. The role of Adolar in Weber's opera "Euryanthe", premiered in 1823 at the Theater am Kärntnertor, was created for him, and he was a soloist in the premiere in 1824 of Beethoven's Ninth Symphony at the same theatre. He continued studies with Antonio Salieri. At this time, Italian opera
La Scala on 25 May 1874 and he announced in 1886 that La Scala would host the premiere of what was to become his penultimate opera, "Otello". The premiere of his last opera, "Falstaff" was also given in the theatre. In 1982, the Filarmonica della Scala was established, drawing its members from the larger pool of musicians that comprise the Orchestra della Scala. The theatre underwent a major renovation from early 2002 to late 2004. The theatre closed following the traditional 7 December 2001 season opening performances of "Otello", which ran through December. From 19 January 2002 to November 2004, the opera