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Common piano chord abbreviations for 7th chords

There is one common abbreviation which may cause confusion:

c7 - refers to C dominant 7th. This is by far the most common kind of 7th chord, which is why it is standard practice to use the shortest abbrevation.

Cmaj7 or sometimes CM7 (with a capital M) refers to the Major 7th chord.

Cmin7 or sometimes Cm7 (with a lower case m) refers to the Minor 7th chord.

A similar short hand is used for 9ths and other extended chords.


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