The clarinet’s overblown twelfth reinvented the reed
Around 1700, Nuremberg maker Johann Christoph Denner (or his son Jacob) added a register key to the chalumeau. Unlike flutes that jump an octave, the new clarinet spoke a twelfth higher—unlocking a second register and, eventually, Mozart's A-major concerto on the longer basset clarinet.
A single-reed woodwind with near-cylindrical bore and flared bell, the clarinet family spans A flat piccolo to BB flat contrabass; the B flat soprano is the default "clarinet." The name links to Latin clarus via French clarinette or Provençal clarin; a 1710 Duke of Gronsfeld order for Jacob Denner's instruments is the earliest "clarinette" mention, with English "clarinet" by 1733. The ancestor chalumeau had eight finger holes, roughly F3–G4, and—unlike today—put the reed against the upper lip.
Denner's second key reached A4 and, with the register key, B flat4; a lengthened bell later pushed down to E3. Classical five-key instruments suited Mozart; he urged a four-semitone extension to C3, yielding Theodor Lotz's basset clarinet (~18 cm longer) for the 1791 A-major concerto. Iwan Müller's stuffed pads (1812) sealed thirteen keys for all-key playing and popularised metal ligature and thumb rest; by the 1830s the reed-down embouchure was standard.
Hyacinthe Klose and Louis Auguste Buffet adapted Boehm's flute rings (1839–43) into the French Boehm clarinet; Oskar Oehler's denser German system still rules Austrian and German orchestras—Richard Strauss preferred its singing tone to French "nasal" colour. Cylindrical bore and odd-harmonic emphasis colour chalumeau, clarion, and altissimo registers; the register key triples vibration frequency for that signature twelfth. From klezmer bands to jazz clubs and symphony pits, the accidental overblow became a fixture of the modern orchestra.
Source: Clarinet
