Chromatic Harmonica with 12 holes, 48 notes and brown-tinted acrylic comb The Standard tuning of the Chromatic Harmonica Purists among the players insist -and they stress- that the key of C is the  only tuning necessary when playing 'Chrom'. They say, that a violinist also does not carry several tuned violins around  to be able to play all classic works. This may be expected in a classic enviroment