 2 "Le Double" is an orchestral work completed in 1959, commissioned by the Koussevitzky Music Foundation for the 75th anniversary of the Boston Symphony Orchestra.It is written for an orchestra and a second group comprising an oboe, a clarinet, a bassoon, a trumpet, a trombone, two violins, a viola, a cello, a harpsichord, a celesta, and kettledrums.The work consists of back and forth between the two instrumental groups, like that of a concerto grosso although the approach is different