The jazz harmonica is majorly a diatonic harmonica but can be chromatic as well. This implies that they have a diatonic scale, with a three-octave range. Jazz harmonica draws its name from the over bending and bending style of harmonica playing. In bending the player is forces the lower of the two reeds in a chamber to vibrate faster as the higher pitched reed vibrates slowly. Over bending involves the player isolating the higher of the two reeds making it possible to play higher pitched notes. Using this two skills, a player can play the entire chromatic scale on the diatonic harmonica. The result of these styles is that more harmonicas paved way for jazz music thus referred to as jazz harmonicas. For the best blues playing, go for the chromatic harmonicas.