Chmel is the modern day revolutionary of the classical harmonica.
Breaking with conventional methods concerning the production of tone and vibrato, plus the instrument's technical limitations, he developed a playing technique which allows him to play the most difficult pieces with a facility and lightness harmonica experts previously thought impossible..
The basics of his opinion were first lectured in a
International Course for Concert Harmonica at Strechau Castle in Austria June 2001
Meanwhile the text was digitalized and is now downlodable here.