Prokofiev's Tuning Fork Prokofiev's tuning fork. Photograph taken at the Museum of Regional Studies in Donetsk, Ukraine, 2001. [Source: Jaroslav Mencl] Back to Photographs page Copyright © 2001, Prokofiev.org and Jaroslav Mencl. This picture may not be reproduced, duplicated, copied, sold, resold, or otherwise exploited for any purpose that is not expressly permitted by the Prokofiev family or Allegro Media.