Hohner 560PBX-BF Special 20 Harmonica Key Of B-flat The Special 20 has reed plates which are recessed into the injection moulded plastic comb, creating a projecting mouthpiece which offers unparalleled playing comfort. Rounded covers with closed sides give a warm, powerful tone which has made the Special 20 a favourite among rock and country players as well as blues musicians, with a rich chord sound thanks to the traditional Hohner tuning.