Dorothy Radde Emery, 76, a music teacher, composer and choir director in the Washington area for many years, died of congestive heart failure Sunday at a hospital in Lancaster, Pa., where she was staying with a son.

Mrs. Emery was born in Cleveland and graduated from the Oberlin College Conservatory of Music, where she majored in piano. She moved to Silver Spring in 1927, when her husband, Alden Hayes Emery, was transferred here by the U.S. Bureau of Mines. He died in 1975.

Mrs. Emery gave private music lessons in her home. She also was a composer and one of her orchestral works was performed by the U.S. Marine Corps Band. She also was a singing coach and accompanied several Washington singers in recital. "So Dark the Night," a Christmas anthem she wrote, won first prize in the 1963 Hymn Anthem contest sponsored by the National Fellowship of Methodist Musicians.

From the late 1930s until the early 1950s. Mrs. Emery was the choir director at Woodside Methodist Church in Silver Spring.

She was a member of the Friday Morning Music Club and the Washington Music Teachers Association.

Survivors include two sons, Dr. Alden H. Jr., of West Lafayette, Ind., and Robert W., of Lancaster, Pa., and five grandchildren.