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The register key is a key on a clarinet which is used to play in the second register; that is, it raises the pitch of most first-register notes by a twelfth (19 semitones) when pressed. It is positioned above the left thumb hole and is operated by the left thumb. The same key used in combination with the left first finger key which produces the written note A4 (in scientific pitch notation) is used to play B♭4. Some clarinets, particularly bass clarinets and lower, have separate keys, or a more complex key mechanism, to control two or three separate holes for playing B♭, for playing the lower notes of the second register, and for playing the upper notes of the second register. The analogous key on the saxophone and the oboe, the octave key, raises the pitch by an interval of an octave. Image File history File links Question_book-3. ... Two soprano clarinets: a Bâ clarinet (left, with capped mouthpiece) and an A clarinet (right, with no mouthpiece). ... In music, a register is the relative height or range of a note, set of pitches or pitch classes, melody, part, instrument or group of instruments. ... Pitch is the perceived fundamental frequency of a sound. ... A semitone (also known in the USA as a half step) is a musical interval. ... This article or section may be confusing for some readers, and should be edited to be clearer or more simplified. ... The bass clarinet is a musical instrument of the clarinet family. ... The saxophone (colloquially referred to as sax) is a conical-bored musical instrument usually considered a member of the woodwind family. ... For other uses, see Oboe (disambiguation). ... The octave key is a key on a saxophone or oboe which raises the pitch of all notes by an octave when pressed. ... For other uses, see Octave (disambiguation). ...
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