A minor seventh chord contains the same notes as an added sixth chord.

This is less of an issue if the chord contains a chordal seventh; indeed, root-position diminished seventh chords are quite common.

All these chords contain the tonic of the song, D-even as a tritone, as is the case in the fourth chord.

The resulting chords contain the minor third, fifth, minor seventh, and ninth, but no root.

Thus, the first and the last chord of each movement contains the note A, either as the root, third, or fifth of a triad.

Extended chords contain more than one triad, and so can be regarded as a type of polychord:

In closed position, extended chords contain dissonant intervals or may sound supersaturated, particularly thirteenth chords with their seven notes.

The German sixth chord contains the same notes as a dominant seventh chord, though it functions differently.

For example, a (second inversion) major chord contains the pitch classes 7, 0, and 4.

Supertonic chords using the notes from the natural minor mode will thus contain a tritone, regardless of inversion.