bass clarinet - LC Linked Data Service: Authorities and Vocabularies | Library of Congress

found: New Grove Online March 18, 2013:bass clarinet (member of the clarinet family, generally pitched in B♭, an octave below the soprano clarinet.Its range is usually extended to E (usually written e; sounding D) on French and English instruments, D (written d; sounding C) on German instruments, and there is a growing tendency to use instruments extended to C (written c; sounding B′) in the manner of the basset-horn.)