Task: Question Generation
Input (English): Passage: Other works that followed continued the composer's new-found seriousness, including many settings of Éluard's surrealist and humanist poems. In 1937 he composed his first major liturgical work, the Mass in G major for soprano and mixed choir a cappella, which has become the most frequently performed of all his sacred works. Poulenc's new compositions were not all in this serious vein; his incidental music to the play La Reine Margot, starring Yvonne Printemps, was pastiche 16th-century dance music, and became popular under the title Suite française. Music critics generally continued to define Poulenc by his light-hearted works, and it was not until the 1950s that his serious side was widely recognised.In 1936 Poulenc began giving frequent recitals with Bernac. At the École Normale in Paris they gave the premiere of Poulenc's Cinq poèmes de Paul Éluard. They continued to perform together for more than twenty years, in Paris and internationally, until Bernac's retirement in 1959. Poulenc, who composed 90 songs for his collaborator, considered him one of the "three great meetings" of his professional career, the other two being Éluard and Landowska. In Johnson's words, "for twenty-five years Bernac was Poulenc's counsellor and conscience", and the composer relied on him for advice not only on song-writing, but on his operas and choral music.Throughout the decade, Poulenc was popular with British audiences; he established a fruitful relationship with the BBC in London, which broadcast many of his works. With Bernac, he made his first tour of Britain in 1938. His music was also popular in America, seen by many as "the quintessence of French wit, elegance and high spirits". In the last years of the 1930s, Poulenc's compositions continued to vary between serious and light-hearted works. Quatre motets pour un temps de pénitence (Four Penitential Motets, 1938–39) and the song "Bleuet" (1939), an elegiac meditation on death, contrast with the song cycle Fiançailles pour rire (Light-Hearted Betrothal), which recaptures the spirit of Les biches, in the opinion of Hell.
Output (English): What were the names of the two people who performed together for more than twenty years?