Having fun with the 1564 chord progression

The song is in C Major Ionian mode and C minor Aeolian mode remember that the minor has a sharp 7.   

Because the Neopolitan scale is different to both C Ionian and C Aeolian it has a very different tone - semitone pattern.

C Major Ionian C D E F G A B C

1 C E G
5 G B D
6 A C E
4 F A C

C Minor Aeolian  A B C D E F G# A

1 A C E
5 E G# B
6 F A C
4 D F A

C Neopolitan Major C Db Eb F G A B C

1 C Eb G
5 G B Db
6 A C Eb
4 F A C


C Neopolitan Minor C Db Eb F G Ab B C

1 C Eb G
5 G B Db
6 Ab C Eb
4 Eb G B


If you listen the bass takes on a different pattern when it changes to the neopolitan varients