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
Rudy La Scala certification in Venezuela. La Scala produced "The Witch", Ambar's second album in 1980; the same year he also produced "Que Nota" for the singer Stella. In 1983, an album written and produced by La Scala, and performed by Arturo Vázquez was released. The theme song for the 1985 soap opera "Cristal", "Mi Vida Eres Tú", was written and performed by La Scala. "Cristal" and the song became very successful in Latin America and Spain. The song was included in La Scala's album "Volvamos a Vivir", which peaked at number two in the "Billboard" Latin Pop Albums chart in United States.