Letter from ethnomusicologist Sidney Robertson Cowell to Frances Schillinger, letting her know that "Henry has been ill…and it is unfortunately impossible for him to undertake to write anything - he is sorry."

Letter from Russian scientist Léon Thérémin to Frances Schillinger (typed manuscript of original handwritten note) discussing both Joseph Schillinger and composer Henry Cowell.

Letter from ethnomusicologist Sidney Robertson Cowell to Frances Schillinger, presumably thanking her for her condolences on the death of composer Henry Cowell.