Two Chords You'll Almost Never See Outside of Classical Music

[kamalayka]

The Neopolitan Chord: A major chord built off of the flatted second degree of a major or minor scale. For example, in C major, you have the notes C, D, E, F, G, A, B, C. The neopolitan chord would be D-flat major. Note that this chord was usually used in the first inversion by classical composers.

The Prometheus Chord:

Try playing this bad boy:

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[Grandturk]

Not enough fingers for the Prometheus...

[Nimitz]

Yeah there is use your thumb for the E and A string

[Endrik]

Prometheus chord is heavily used in jazz improvisations and modern instrumental film music.
Neapolitan chord is something pretty common for anyone who messes around on the piano.