Historical and biographical files, including a copy of the manuscript and published volume of Duo-pianism, other publications, and last will and testament; musical works from various composers; records of the Spokane Conservatory of Music, including the conservatory guestbook; the Hans Moldenhauer Memorial Lecture Series; recordings of the Hans Moldenhauer Memorial Lecture Series, Webern Festival, and various tributes; images and descriptions of instruments included in the collection; images and descriptions of art works included in the collection; and the Etude Magazine collection.