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Contrabassoon

Lower-pitched instrument of the bassoon family

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  • 6 chapters

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Differences from the bassoon

The reed is considerably larger than the bassoon's, at 65–75 mm (2.6–3.0 in) in total length (and 20 mm (0.8 in) in width) compared with 53–58 mm (2.1–2.3 in) for most bassoon reeds. The large blades allow ample vibration that produces the low register of the instrument. The general structure of the reed is very similar to a bassoon reed, and as with bassoon reeds scraping the reed affects the intonation, tone and response of the instrument.

Contrabassoons possess a simplified version of bassoon keywork, although all open toneholes on bassoon are necessarily replaced with keys and pads due to the physical distances. In the lower register, its fingerings are almost identical to bassoon's. However, differences in fingering begin in the second register, and are totally unrelated in the high register, partly because contrabassoon's harmonic series is different to bassoon's.

The instrument is twice as long as the bassoon, curves around on itself twice and, due to its weight and shape, is supported by an endpin rather than a seat strap. Accounting for length, the bore is narrower than bassoon's, although still wider than that of an oboe or cor anglais. Additional support is sometimes provided by a strap around the player's neck. A wider hand position is also required, as the primary finger keys are widely spaced. The contrabassoon has a water key to expel condensation and a tuning slide for gross pitch adjustments. The instrument comes in a few pieces (plus bocal); some models cannot be disassembled without a screwdriver. Sometimes, the bell can be detached, and instruments with a low A extension often come in two parts.

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