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
Aureliano in Palmira Rossini in "Elisabetta, regina d'Inghilterra" and in "The Barber of Seville". It premiered at La Scala in Milan on 26 December 1813. 19th century "Aureliano in Palmira" was Rossini's second commission from La Scala. It opened the theatre's Carnival season with the famed castrato, Giovanni Battista Velluti as Arsace. It was the only role that Rossini wrote for the castrato voice. Rossini had originally written the role of Aureliano for Giovanni David, one of the most renowned tenors of the day. However, throat problems during rehearsals led David to withdraw from the production, and Luigi Mari took his place. The