In 1999, he made his debut at the Open Air Classic Festival in Berlin with soprano Montserrat Caballe, under the direction of maestro José Collado.
"His Vocal projection demonstrated a robust voice of great caliber and also shone high in the repertoire of operetta and zarzuela"
Astrid Weidauer, Berliner Morgenpost, Berlin.
Since his debut Oscar Marín has performed numerous recitals and concerts in important Auditoriums, Theaters and Festivals in Europe, such as the Royal Albert Hall in London, St. John's Smith Square in London, the Deutsche Oper in Berlin, the berliner Philharmonie, the Festpielhaus in Baden-Baden, the Musikhalle of Hamburg, the Alte Oper of Frankfurt, the Liederhalle of Stuttgart, the Kölner Philharmonie of Cologne, the Ostseehalle of Rostock, the Musik und Kongresshall