The contrabass oboe is a double reed woodwind instrument in the key of C or F, sounding two octaves or an octave and a fifth (respectively) lower than the standard oboe.
Recent research, in particular that by oboe historian Bruce Haynes,[full citation needed] suggests that such instruments may have been developed in France as part of an attempt to maintain the complete family of double reed instruments when the oboe was created from the shawm.
This apparently was an oboe-type instrument in the bassoon range.
Richard Strauss states, in his edition of Hector Berlioz's Treatise on Instrumentation, that its tone "...had not the slightest similarity with the low tones of the bassoon" (Berlioz and Strauss 1948, [page needed]).
Despite this distinction, the contrabass oboe never became popular or widely used, and few remain today.