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 La Scala Theatre Orchestra. The theatre also has an associate school, known as the La Scala Theatre Academy (), which offers professional training in music, dance, stage craft and stage management. La Scala's season opens on 7 December, Saint Ambrose's Day, the feast day of Milan's patron saint. All performances must end before midnight, and long operas start earlier in the evening when necessary. The Museo Teatrale alla Scala (La Scala Theatre Museum), accessible from the theatre's foyer and a part of the house, contains a collection of paintings, drafts, statues, costumes, and other documents regarding La Scala's and opera