Wikipedia states the following for the A major scale

The key of A major is the only key where a Neapolitan sixth chord on 2 requires both a flat and a natural accidental.

Can anyone explain what the above means and how does that relates to the scale on a guitar

2 Answers 2


The Neapolitan sixth chord is a major triad with its root on the ♭2 of the scale, most commonly played in first inversion. So in A major it is a Bb major triad, which in first inversion is:

D F Bb

Since the A major scale contains an F# and a B, in order to get the required F and Bb you need one natural (for the F) and one flat (for the Bb).

A Neapolitan sixth chord in A-major (3#) needs a natural (F) and a flat (B) accidental:




A  Bb_G# A  
E  F♮_E  E  
C# D  D  C#  

A  D  E  A

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.