Piano Sonata No.2 - Concord, Mass., 1840-1860 (2nd Edition)

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.

1. I. "Emerson" (after Ralph Waldo Emerson)
2. II. "Hawthorne" (after Nathaniel Hawthorne)
3. III. "The Alcotts" (after Bronson Alcott and Louisa May Alcott)
4. IV. "Thoreau" (after Henry David Thoreau)

The Concord Sonata is unusual in many ways, often lacking barlines and using advanced harmonies. Particularly unusual is the requirement for a 14 3⁄4-inch (37 cm) piece of wood in the second movement, used to create cluster chords.