Sur le même accord (On only one chord) is a piece by the French composer Henri Dutilleux for solo violin and orchestra.
It was composed for the violinist Anne-Sophie Mutter, and was premiered by her on 28 April 2002 in London with the London Philharmonic Orchestra conducted by Kurt Masur.
Dutilleux describes the piece as "a nocturne-like work".
The piece also features the Dutilleux trademark of mirror writing, which can be heard in several passages.
The work is tonally centered on G, which is established by assertion, most notably by the repeated use of the violin's low open G. The orchestration of the works is: 2 flutes (1st doubles Piccolo), 2 oboes, 2 clarinets, 1 Bass Clarinet, 2 bassoons, 2 Horns, 2 trumpets, 2 trombones, tuba, timpani, 3 percussion, harp and strings