Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: As the decade progressed, Poulenc produced a range of compositions, from songs to chamber music and another ballet, Aubade. Hell suggests that Koechlin's influence occasionally inhibited Poulenc's natural simple style, and that Auric offered useful guidance to help him appear in his true colours. At a concert of music by the two friends in 1926, Poulenc's songs were sung for the first time by the baritone Pierre Bernac, from whom, in Hell's phrase, "the name of Poulenc was soon to be inseparable." Another performer with whom the composer came to be closely associated was the harpsichordist Wanda Landowska. He heard her as the soloist in Falla's El retablo de maese Pedro (1923), an early example of the use of a harpsichord in a modern work, and was immediately taken with the sound. At Landowska's request he wrote a concerto, the Concert champêtre, which she premiered in 1929 with the Orchestre Symphonique de Paris conducted by Pierre Monteux.The biographer Richard D. E. Burton comments that, in the late 1920s, Poulenc might have seemed to be in an enviable position: professionally successful and independently well-off, having inherited a substantial fortune from his father. He bought a large country house, Le Grande Coteau, at Noizay, Indre-et-Loire, 140 miles (230 km) south-west of Paris, where he retreated to compose in peaceful surroundings. Yet he was troubled, struggling to come to terms with his sexuality, which was predominantly homosexual. His first serious affair was with the painter Richard Chanlaire, to whom he sent a copy of the Concert champêtre score inscribed, "You have changed my life, you are the sunshine of my thirty years, a reason for living and working". Nevertheless, while this affair was in progress Poulenc proposed marriage to his friend Raymonde Linossier. As she was not only well aware of his homosexuality but was also romantically attached elsewhere, she refused him, and their relationship became strained. He suffered the first of many periods of depression, which affected his ability to compose, and he was devastated in January 1930 when Linossier died suddenly at the age of 32. On her death he wrote, "All my youth departs with her, all that part of my life that belonged only to her. I sob ... I am now twenty years older". His affair with Chanlaire petered out in 1931, though they remained lifelong friends.
What was the names of the two friends who the concert of music was by in 1926?