Poulenc felt that he needed more lessons and he studied with Charles Koechlin. He was asked by Diaghilev to write ballet music for "Les Biches". He composed his "Concerto for Two Pianos" and the "Organ Concerto". He was very upset by the death of Raymonde Linossier who was the only woman he ever wanted to marry. Poulenc was becoming aware that he was gay. He had a lot of emotional problems with big changes of mood.