The bass oboe or baritone oboe is a double reed instrument in the woodwind family. It is essentially twice the size of a regular (soprano) oboe so it sounds an octave lower; it has a deep, full tone somewhat akin to that of its higher-pitched cousin, the English horn. The bass oboe is notated in the treble clef, sounding one octave lower than written. Its lowest sounding note is B2 (in scientific pitch notation), one octave and a semitone below middle C, although an extension with an additional key may be inserted between the lower joint and bell of the instrument in order to produce a low B2. The instrument's bocal or crook first curves away from and then toward the player (unlike the bocal/crook of the English horn and oboe d'amore), looking rather like a flattened metal question mark; another crook design resembles the shape of a bass clarinet neckpiece. The bass oboe uses its own double reed, similar to but larger than that of the English horn. Etymology The instrument is known popularly as the "bass oboe" in the English language and "hautbois baryton" (baritone oboe) in French. The bass designation is in resonance with that of the bass flute in the flute family and the bass clarinet in that family: an instrument pitched an octave below the principal instrument of its genre. History Early bass oboes were modeled after bassoons, with a boot joint and bocal (such as the Triebert's'instruments, which still had a bulb bell) and some holes drilled obliquely; later an enlarged English horn design was adopted. The concept of the bass oboe as an enlarged English horn survived, and the hautbois baryton, redesigned by François Lorée, was introduced in 1889. Some confusion exists between the bass oboe and the Heckelphone, a double reed instrument of similar register introduced by the firm of Wilhelm Heckel in 1904, and which is distinguished from standard members of the oboe family by its wider bore, different fingering system (on older instruments), and larger bell. As a result, it is not always clear in English orchestral works of the early 20th century which of the two instruments is intended when the composer requests "bass oboe". The instrument has been manufactured sporadically by various companies, including F. Lorée, Marigaux, Rigoutat, Fossati, and others. It is usually a "special order" instrument, and its purchase price normally exceeds that of a top-of-the-line