Premise: Les Soirées de Nazelles, FP 84, is a set of variations for piano written by the French composer Francis Poulenc. During the evenings, the composer used to sit at the piano and improvise "portraits" of his friends, all based on a given theme. The work was begun in 1930, and completed at Noizay on October 1, 1936. At the beginning of the score, it reads:
Hypothesis: Franic Poulenc worked on Les Soirées de Nazelles every day for six years.