The final development in the modern design of the clarinet used in most of the world today was announced by Hyacinthe Klosé in 1839. He devised a unique association of keys and finger holes, which permit simpler fingering. It was encouraged by the Boehm system built for flutes by Theobald Boehm. Klosé was so inspired by Boehm's invention that he named his own system for clarinets the Boehm system, however it is various from the only used on flutes. This new system was slow to gain popularity but steadily became the typical, and today the Boehm system is used all over on earth except Germany and Austria. These nations still use an instantaneous descendant of the Mueller clarinet referred to as the Oehler system clarinet. Also, some modern Dixieland gamers proceed to use Albert system clarinets. Before about 1800, because of the loss of airtight pads see History, useful woodwinds could have just some keys to control accidentals notes external their diatonic home scales. The low chalumeau sign up of the clarinet spans a 12th an octave plus an ideal fifth, so the clarinet needs keys/holes to supply all nineteen notes during this range. This comes to more keywork than on contraptions that "overblow" at the octave—oboes, flutes, bassoons, and saxophones, as an example, which need only twelve notes before overblowing. Clarinets with few keys cannot therefore easily play chromatically, proscribing this type of tool to some carefully associated keys.

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