Beethoven-Haus Bonn

Bonn, Germany

British Library

London, United Kingdom

Morgan Library & Museum

New York City, NY, U.S.A.

National Library of Russia

Saint Petersburg, Russia

Royal College of Music

London, United Kingdom

Cover image: Johannes Vermeer, Lady Writing a Letter with her Maid, c. 1670 - 1671 (detail). © National Gallery of Ireland, Dublin.