He also started to write along with Ferrer songs for her to sing, among which “Balada para un loco” is the most famous one. Its first performance at Estadio Luna Park in 1969 aroused a scandal reminiscent of Igor Stravinsky's “The rite of spring” riot in 1913. Immediately released as a single by CBS Records International, it sold 200.000 copies in just a few weeks, thing that could only be achieved at the time in Argentina by foreigner stars such as The Beatles or local pop singers such as Palito Ortega and Sandro de América.