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The contrabass recorder plays an octave lower than the ordinary bass (or "basset") recorder. Until recently, it was the largest instrument in the recorder family, but since 1975 has been exceeded by the sub-great bass recorder (also called "contra-great bass" or simply "contrabass" recorder) in C2 and the sub-contrabass recorder in F1.
Due to the length of the instrument, the lowest tone, F, requires a key. On modern instruments, keys may also be provided for low F♯, G, and G♯, and sometimes for C and C♯ as well.
Occasionally, this size of instrument may be equipped with so-called "diapason" keys, which extend its range downward by a perfect fourth to low C2.
In the early 17th century, Michael Praetorius used the diminutive term "basset" (small bass) to describe the recorder that served as the lowest member of the "four-foot" consort, in which the instruments sound an octave higher than the corresponding human voices. Praetorius calls the next-lower instrument (bottom note B♭2) a "bass", and the instrument an octave lower than the basset (with bottom note F2) a Großbaß, "great" or "large bass".
Because Praetorius's term "great bass" today is often applied to the next-smaller size of instrument in C3, the low-F bass is often designated "contrabass" by modern writers and instrument makers in a (largely futile) attempt to avoid confusion. However, the name "contrabass" is sometimes used for the next-larger size (in C2), instead. The modern notation for this instrument is usually in the bass clef at sounding pitch, unlike most other sizes of recorders which are notated an octave lower than they sound.
- Baines, Anthony C. 1967. Woodwind Instruments and Their History, third edition, with a foreword by Sir Adrian Boult. London: Faber and Faber. Reprinted with corrections, 1977. This edition reissued, Mineola, New York: Dover Publications, Inc., 1991, and reprinted again in 2012. ISBN 978-0-486-26885-9.
- Lasocki, David. 2001. "Recorder". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- Praetorius, Michael. 1619a. Syntagmatis Musici Michaelis Praetorii C. Tomus Secundus De Organographia. Wolfenbüttel: Elias Holwein, in Verlegung des Autoris.
- Sachs, Curt. 1913. Real-Lexikon der Musikinstrumente, zugleich ein Polyglossar für das gesamte Instrumentengebiet. Berlin: Julius Bard.
- Griscom, Richard W., and David Lasocki. 2013. The Recorder: A Research and Information Guide, third edition. Routledge Music Bibliographies. Routledge. ISBN 9781135839321.
- Praetorius, Michael. 1619b. Syntagmatis Musici Michaelis Praetorii C. Tomus Tertius. Wolfenbüttel: Elias Holwein.