Varèse, Edgard. (1883–1965) "Density 21.5" – Inscribed Score "en evocation d'un staccato de timbales"The French American composer's only work for flute alone in its revised version. Quarto. 12 x 9. 5 inches (30. 5 x 24. 3 cm). Unpaginated bifolium (2 pages of music). Inscribed by the composer to the title Peter Smith, then an engineering student working at the Columbia Princeton Electronic Music Center, who had assisted Varse with some of his early pioneering efforts in electronic music, and recalling their efforts together to achieve a computer