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.