The 1955 overthrow of President Juan Perón led to the State Symphony's reorganization as the Argentine National Symphony. Its first post-Perón conductor, former Colón Opera House Director Juan José Castro, had returned from exile and took the baton to acclaim on November 11, leading the symphony in their performance of "La Mer", by Claude Debussy. He worked to widen its appeal by incorporating works by contemporary composers such as Olivier Messiaen, Paul Hindemith, Igor Stravinsky and Béla Bartók, and by securing guest conductors such as Willem van Otterloo and Igor Stravinsky, who conducted performances of his own works in 1960. Frustrated by bureaucratic tedium, however, Castro resigned in October.