Pencil drawing of a bookplate by Joseph Schillinger illustrating his theories about the "Mathematical Basis of the Arts". Graphite pencil on paper.

Letter from composer Henry Cowell to Arnold Shaw, letting Shaw know that "I'll get at the writing of the introductory remar[k]s pronto."

Mechanical aid constructed by Joseph Schillinger to illustrate his "Schillinger System" of composition. Pasteboard and brass fasteners.

Mechanical aid constructed by Joseph Schillinger to illustrate his "Schillinger System" of composition. Pasteboard and brass fasteners.

Receipt from the New York Times Company, recording that composer Henry Cowell was paid for his article "Case for system" that appeared in the Sunday Section of the newspaper.

46 pages of ms. music ; 21 x 32 cm. Title on cover: Songs. Inscribed on final leaf; J. W. D. Salter, ijus liber, Novb. 18th 1806. FRIEDHEIM: THE SALTER-WILLIAMS FAMILY COLLECTION OF MUSIC. M1 .T45 v.11 c. 1

Photograph and oral history.

Postcard from ethnomusiologist Sidney Robertson Cowell to Frances Schillinger, asking about the Rhythmicon [the first electronic rhythm machine built by Russian inventor Louis Theremin]: "could a composer afford to buy it? ...

Two acrylic paintings by Joseph Schillinger, illustrating his theories about the "Mathematical Basis of the Arts". Acrylic paint on paper.

Letter from Frances Schillinger to composer Henry Cowell, noting that she is "delighted that you offered to talk personally to publishers about Joseph's music. If you could take enough time to do this, I would have hopes ...