The piano trio has been a favorite medium for composers since its inception with Franz Joseph Haydn's compositions for violin, cello, and piano. There have been numerous compositions by many composers since that time, and the piano trio continues to interest composers today. In the United States composers began writing for this combination in the nineteenth century, following European traditions. In the twentieth century, the number of composers and compositions has seen a phenomenal increase. American Piano Trios: A Resource Guide provides information about works for piano trios (violin, cello, and piano) by American composers, including naturalized United States citizens. The information includes a brief biographical sketch of each composer, occasional comments by the composer, and notable information that might lead to a further exploration of his or her work and possible performance. Two appendixes provide contact information about active performers of piano trios and a list of classical music websites.