The papers of Robert C. Marek span a fifty-year period from 1944-1994. The collection contains original musical compositions with director's scores, orchestration, choral accompaniment, as well as arrangements and transcriptions; correspondence; teaching materials; programs of musical productions; historic photographs; newspaper clippings; pamphlets; books; and classical compositions by the masters. Additional materials include correspondence, biographical sketches of South Dakota composers; teaching material; class notes & grade books; programs of musical productions; historic photographs; newspapers clippings; pamphlets; sheet music copies and transcriptions of classical music by master composers.
The bulk of the collection consists of Marek's original musical compositions. A list is available. The compositions are arranged in chronological order according to the date completed. Undated works are arranged alphabetically. Many of the works are written in pencil in Marek's hand. A number of the compositions include annotation. A variety of works make up Marek's musical compositions, including: symphonies, cantatas, marches, overtures, musical theatre, operas and Christmas suites. A work of special significance is the composition, Cantata for a Dedication, which was performed in Washington DC during the bicentennial celebration. Another significant feature of the collection is Marek's arrangements of Moravian hymns, Three Preludes on Moravian Hymns for Organ, which was commissioned by James Boeringer, Director of the Moravian Foundation. References to the Moravian works are included in the correspondence section of Marek's papers. Collaborative works include: All Things Begin, And the Lord Said, and Four songs from the Tree of Bones, composed with the poet, John Milton; Prosopa, a satiric opera and the opera, Arabesque, both written with dramatist Wayne Knutson.