JACOBI, FREDERICK (1891–1952), U.S. composer. Born in San Francisco, Jacobi studied with Rubin *Goldmark, Rafael Joseffy, Paul Juon, and Ernest *Bloch. From 1913 to 1917 he was assistant conductor at the Metropolitan Opera in New York and later taught at the Juilliard School of Music. Jacobi first attracted attention as a composer with a quartet on American Indian themes (1923). Many of his later works were on Jewish subjects or for synagogue use. Sabbath Evening Service (1930–31); Six Pieces for Organ, for use in the synagogue (1933); arrangements of Palestinian folk songs (1939–40); Hymn to words of Saadiah Gaon, for male choir; Two Pieces in Sabbath Mood, for orchestra (1946); Ashrei ha-Ish – arrangements of the song by Mordechai *Zeira – for mixed chorus and string orchestra (1949); and Three Preludes, for organ (1949).