another well-known orchestral work is "three places in new england". his best-known piano work is his "concord sonata". ives often liked to quote bits of other pieces, and in this piano sonata he quotes the famous opening of beethoven's "fifth symphony". it also has an interesting example of one of ives' experiments: in the second movement, he tells the pianist to use a 14¾ in (37.5 cm) piece of wood to make a thick but soft cluster chord. the sonata is one of the best piano works of the 20th century.