Bass clarinet in the context of "Contrabass clarinet"

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 B♭₂. 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.

Antoine-Joseph "Adolphe" Sax (French: [ɑ̃twan ʒozɛf adɔlf saks]; 6 November 1814 – 7 February 1894) was a Belgian inventor and musician who invented the saxophone in the early 1840s, patenting it in 1846. He also invented the saxotromba, saxhorn and saxtuba, and redesigned the bass clarinet in a fashion still used in the 21st century. He played the flute and clarinet.

The clarinet family is a woodwind instrument family of various sizes and types of clarinets, including the common soprano clarinet in B♭ and A, bass clarinet, and sopranino E♭ clarinet.

Clarinets that aren't the standard B♭ or A clarinets are sometimes known as harmony clarinets. There are many differently pitched clarinet types that may be grouped into sub-families, but grouping and terminology vary; the list below reflects popular usage.