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 Alonso, Guillermo Dávila, Kiara, Ruddy Rodríguez, Proyecto M, Carlos Mata, Las Payasitas Nifu Nifa and Gerardo Mora. As a performer, La Scala reached the top of the "Billboard" Top Latin Songs chart twice with "El Cariño Es Como Una Flor" and "Por Qué Será" in the 1990s. He is the only record producer with 12 platinum and nine gold certified albums in Venezuela. He also performed the theme song of the Venezuelan soap opera "Cristal" among others. At age 15, La Scala formed a rock band named Las Explosiones de Goma. In 1971, he debuted as a solo artist, and