Solo tuning

Solo tuning is a system of choosing the reeds for a diatonic wind instrument (such as a harmonica or accordion) to fit a pattern where blow notes repeat a sequence of

(perhaps shifted to begin with E or with G) and draw notes follow a repeating sequence of

(perhaps correspondingly shifted). Or. alternately, these blow notes and draw notes, raised by a semitone, to

and to

Traditionally, this tuning is used with chromatic harmonicas, as opposed to the more common and popular diatonic harmonicas, which use Richter tuning.

For example:

and

...
Wikipedia