With Boulanger he studied classical composition, including counterpoint, which was to play an important role in his later tango compositions. Before leaving Paris, he heard the octet of the American jazz saxophonist Gerry Mulligan, which was to give him the idea of forming his own octet on his return to Buenos Aires. He composed and recorded a series of tangos with the String Orchestra of the Paris Opera and began to play the bandoneon while standing up, putting his right foot on a chair and the bellows of the instrument across his right thigh. Until that time bandoneonists played sitting down.