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
Raquel Pierotti débuts at the Opera de Paris as Rosina in Rossini’s Barber of Seville, as well as at La Scala, Milan, as Marcellina in Mozart’s Le nozze di Figaro. Since then she has been a frequent guest at La Scala where she sang Clarice in La pietra del paragone (Rossini), Smeton in Anna Bolena (Donizetti), Rosina in Il barbiere di Siviglia (Rossini), Isabella in L’italiana in Algeri (Rossini), Maddalena in Il viaggio a Reims (Rossini), Cecilio in Lucio Silla (Mozart), and Fenena in Nabucco (Verdi) for the 1986/1987 Season Opening Night as well as in the tournées in Berlin, Japan (Tokyo,