The biographer Arbie Orenstein writes that while touring the US in 1928, Ravel had been "impressed by its jazz, Negro spirituals and the excellence of its orchestras". Jazz had been popular in Paris since the start of the decade: Ravel had first heard, and enjoyed, it in 1921, and its influence is heard in the violin sonata, completed in 1927, and in the D major piano concerto. The Basque theme mooted in 1906 and 1913 was not wholly abandoned. His colleague Gustave Samazeuilh believed that Ravel drew on his earlier ideas for the outer movements of the G major concerto, and Orenstein notes a Basque influence in the opening theme of the work.