Diminished tuning is a system of choosing the reeds for a diatonic wind instrument (such as a harmonica or accordion) in which the blow notes repeat a sequence of

C E♭ F♯ A

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and draw notes follow a repeating sequence of

D F G♯ B

(perhaps shifted to begin with E♭ and F, with F♯ and G♯, or with A and B).

For example:

^[1]

• Augmented tuning
• Country tuning
• Harmonic minor tuning
• Major seventh tuning
• Melody Maker tuning
• Natural minor tuning
• Paddy Richter tuning
• Richter tuning
• Solo tuning