It's probably no secret that I love Bulgarian #kaval.
Here's Kiril Belezhkov, who was my teacher for a while, performing a set of melodies by Dragan Karapchanski. The melodies start with a section in kaba. Kaba is a technique that only works on rim-blown #flutes where you essentially force the #flute to play the lowest octave fundamental and various overtones simultaneously, resulting in a very full and expressive sound. Some kavals do this easier than others, but even so, some professional players never find kaba. All the micro adjustments to embouchure and breath for finding the sound, and then for each note, are simply impossible to describe, thus teach.
After the kaba section he goes into more normal playing in the 2nd and 3rd registers. All of it is performed with great techniques, such as hlopki (lit. bells; switching between alternate fingerings for the same note) and exceptional finger-vibrato. #ethnomusicology #Bulgaria #music #organology #WorldMusic
https://www.youtube.com/watch?v=1V8h2jpSP-I