Ernő Lendvai (February 6, 1925 – January 31, 1993) was one of the first music theorists to write on the appearance of the golden section and Fibonacci series and how these are implemented in Bartók's music, he also formulated the axis system, acoustic scale and alpha chord, an octatonic scale is any which number note musical scale?
Ernő Lendvai Ernő Lendvai (February 6, 1925 – January 31, 1993) was one of the first music theorists to write on the appearance of the golden section and Fibonacci series and how these are implemented in Bartók's music. He also formulated the axis system, acoustic scale and alpha chord.
Oehler system The Oehler system is a system for clarinet keys developed by Oskar Oehler. Based on the Müller system clarinet, the system adds tone holes to correct intonation and acoustic deficiencies, notably of the forked notes (B♭ and F). The system has more keys than the Böhm system, up to 27 in the Voll-Oehler system (full Oehler system). It also has a narrower bore and a longer, narrower mouthpiece leading to a slightly different sound. It is used mostly in Germany and Austria. Major developments include the patent C♯, low E-F correction, fork-F/B♭ correction and fork B♭ correction. Fingering charts can be found for example in this reference.