The Piano Sonata No. 2, Concord, Mass., 1840–60 (commonly known as the Concord Sonata) is a piano sonata by Charles Ives. It is one of the composer's best-known and most highly regarded pieces. A typical performance of the piece lasts around 45 minutes.
Some material in the Concord Sonata dates back as far as 1904, but Ives did not begin substantial work on it until around 1911 and largely completed the sonata by 1915. The Concord Sonata was first published in 1919 with a second, revised, edition appearing in 1947. It is this version which is usually performed today. In 2012, a reprint of the original, uncorrected 1920 edition was published, including Essays before a Sonata and with an added introductory essay by the New England Conservatory's Stephen Drury.
According to James B. Sinclair's catalogue of Ives' works, the sonata was publicly premiered by John Kirkpatrick on November 28, 1938 in Cos Cob, Connecticut. There had been earlier performances of isolated movements and excerpts. The second performance (given in many sources as the premiere), also given by Kirkpatrick, was given at the Town Hall in New York City on January 20, 1939. Among those present was Elliott Carter, who reviewed the piece in the March–April 1939 edition of the journal Modern Music.
The sonata's four movements represent figures associated with transcendentalism. In the introduction to his Essays Before a Sonata (published immediately before the Concord Sonata) Ives said the work was his "impression of the spirit of transcendentalism that is associated in the minds of many with Concord, Massachusetts of over a half century ago. This is undertaken in impressionistic pictures of Emerson and Thoreau, a sketch of the Alcotts, and a scherzo supposed to reflect a lighter quality which is often found in the fantastic side of Hawthorne."
The four movements are:
The piece demonstrates Ives' experimental tendencies: much of it is written without barlines, the harmonies are advanced, and in the second movement, there is a cluster chord created by depressing the piano's keys with a 14 3⁄4-inch (37 cm) piece of wood. The piece also amply demonstrates Ives' fondness for musical quotation: the opening bars of Ludwig van Beethoven's Symphony No. 5 are quoted in each movement. Sinclair's catalogue also notes less obvious quotations of Beethoven's Hammerklavier Sonata and various other works. Unusually for a piano sonata, there are optional parts for other instruments: near the end of the first movement there is an optional part for viola, and in the last movement a flute (an instrument which Thoreau played) briefly appears.