The oboe is usually made from grenadilla (or african blackwood), but some manufacturers also make oboes out of high-quality plastic resin. The oboe has an extremely narrow conical bore[?], and double-reed mouthpiece consisting of two thin blades of cane tied together on a small-diameter metal tube. This setup leads to overblowing[?] at the octave (compared to the clarinet, which overblows a twelfth). The commonly accepted range for the oboe extends from Bb3 to A6, nearly three octaves. Together with the flute/recorder it is one of the oldest woodwind instruments.
The oboe has several sibling instruments. The most widely known today is the cor anglais (English Horn), which evolved from the Baroque oboe da caccia. Both are pitched a perfect fifth lower than the standard oboe. The oboe d'amore, also popular during the Baroque period, is pitched a minor third lower than the oboe. Johann Sebastian Bach used the oboe d'amore extensively.
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