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Diemer has written many works for orchestra, chamber ensemble, keyboard, voice, chorus (women's, men's), and electronic media. Diemer is a keyboard performer and over the years has given concerts of her own organ works at Washington National Cathedral, The Cathedral of Our Lady of the Angels in Los Angeles, Grace Cathedral and St. Mary's Cathedral in San Francisco, and others.
Works include many collections and single pieces for organ as well as many for solo piano, piano 4 hands, and two pianos. Her major chamber works include a piano quartet, string quartet, two piano trios, and sonatas and suites for flute, violin, cello, and piano as well as settings of the psalms for organ with other instruments. Diemer has written many choral works as well. She has written numerous hymns, several of which appear in church hymnals. Her songs number in the dozens, using texts by many contemporary and early poets including Walt Whitman, Amy Lowell, Sara Teasdale, Alice Meynell, Thomas Campion, Shakespeare, John Donne, her sister Dorothy Diemer Hendry, Emily Dickinson, Robert Lowell, and many others.
Diemer's compositional style over the years has varied from tonal to atonal, from traditional to experimental. She has written works for non-professional and professional performers, originally under the "Gebrauchsmusik" philosophy, but has produced many works, particularly for keyboard, that are difficult and challenging. The latter category includes her "Fantasy" for piano; Seven Etudes for piano; Homage to Cowell, Cage, Crumb, and Czerny for two pianos; Variations for Piano Four Hands (Homage to Ravel, Schoenberg, and May Aufderheide); Four Biblical Settings for organ, Concerto for Organ ("Alaska"); and many psalm setting collections. The totally serial "Declarations" for organ (1973) contrasts to the more tonal 2013 concerto for violin and orchestra "Summer Day". Her work in the electronic field during her years on the faculty of the University of California influenced a number of works including her Toccata for piano that has a number of performances on YouTube.
Diemer received both her B.M. and her M.M from the Yale School of Music in 1949 and 1950, respectively. She then went on to study composition in Brussels, Belgium on a Fulbright Scholarship from 1952 to 1953, ultimately returning to the United States to receive her Ph.D from the Eastman School of Music in 1960. She was professor of theory and composition at the University of Maryland 1965-70, and joined the faculty of the University of California (UCSB) in 1971. She is professor emeritus, 1991-present.
While at UCSB, Diemer helped to establish the computer/electronic music program.
She was composer-in-residence with the Santa Barbara Symphony 1990-92. The symphony premiered 4 of her works:
Other notable works:
Two important collaborations, among many, with fellow musicians were with Joan Devee Dixon, organist, who commissioned over 50 works for organ and various instruments and instrumental ensembles from Diemer during the 1990s and early 2000, and Philip Ficsor, violinist, who commissioned several violin and piano compositions from Diemer and recorded her complete works for violin and piano and including the concerto for violin (2013).
Diemer's parents were George Willis Diemer (1885-1956), American educator, college president, one of a group of American educators who were sent by the U.S. Dept. of State to reorganize the educational system of Japan after World War II; and Myrtle Diemer née Casebolt (1889-1961), church worker and homemaker. Diemer's siblings were poet/teacher Dorothy Diemer Hendry (1918-2006); George Willis Diemer II (1920-1944), Marine fighter pilot, musician/teacher; John Irving Diemer (1920-1964), school principal/musician in Overland Park, KS.