The Neapolitan sixth chord is most often used in first inversion. The next example, from Chopin's Prelude No. 20, shows the chord in root position. As the key is C minor, the Neapolitan sixth chord is D♭ major.

Occasionally, the Neapolitan sixth chord is followed by an auxiliary diminished seventh chord of the fifth degree. Bach's G minor choral Ach Gott, vom Himmel sieh darein is a good example:

The following excerpt is from the Andante movement of Mozart's Concerto K. 488. Click on the measure where you find the Neapolitan sixth chord. This chord appears in two measures — can you identify them? If the key of the piece is F# minor, which major chord is a semitone above? You will probably find the chord in first inversion.

Click the measures where you see a Neapolitan sixths...	Tell Me