Library of Congress
Authorities & Vocabularies
found: Beethoven, L. van. The complete four hand piano works, 2009: container (arrangement, William Watts) insert (English violist; secretary of the Royal Philharmonic Society when it was founded in 1813)
notfound: Oxford music online, Mar. 18, 2010;Oxford dict. of nat. bio.;Clive, P. Beethoven and his world, 2001.