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 Theatre Ballet School La Scala Theatre Ballet School La Scala Theatre Ballet School () is one of the leading classical ballet schools in the world and is the associate school of La Scala Theatre Ballet, an international ballet company based at La Scala in Milan, Italy. The school forms part of the theatre's Academy for Performing Arts. The ballet school was founded in 1813 by Benedetto Ricci, as the "Accademia di ballo" (dance academy) of the "Teatro alla Scala". Following the defeat of Napoleon, the school's name was changed to "Imperial Regia Accademia di Ballo del Teatro alla Scala" (Royal Imperial Dance Academy