Cowell, Henry. (1897 - 1965) Encores. Opus I. - Autograph Manuscript and ArchiveA highly important archive from the pioneering American composer best known for his experimental, avant garde works employing a wide range of innovative sonic resources, including new ways of playing the piano. The autograph manuscript is of the composer's hitherto unpublished and previously thought lost complete Opus I composition, of central importance to a complete understanding of the composer's oeuvre. Autograph Manuscript in pencil. Upright