Even when he wrote for a large orchestra, Poulenc used the full forces sparingly in his operas, often scoring for woodwinds or brass or strings alone. With the invaluable input of Bernac he showed great skill in writing for the human voice, fitting the music to the tessitura of each character. By the time of the last of the operas, "La Voix humaine", Poulenc felt able to give the soprano stretches of music with no orchestral accompaniment at all, though when the orchestra plays, Poulenc calls for the music to be "bathed in sensuality".