Minor 6th chords
The Minor 6th chord is a four-note chord that adds the sixth degree note in the scale to the minor triad. By comparing Cm with Cm6 we could see that the notes changes from C, Eb, G to C, Eb, G, A. The chord can be a substitute for a common minor, but could sound somewhat dissonant depending on the musical circumstances.
Minor 6th chords in open positions
These are, generally, chords in open position, with Cm6 as an exception which is a closed chord (having no loose strings). Also noticeable is that Cm6, Fm6 and Bm6 are played with alternative bass notes, see different versions below.
Chord constructionCm6 x - x - Eb - A - C - G
Dm6 x - x - D - A - B - F
Em6 E - B - E - G - C# - E
Fm6 x - x - D - Ab - C - F
Gm6 G - Bb - E - G - D - E
Am6 x - A - E - A - C - F#
Bm6 x - x - D - G# - B - F#
Guitar versions of the chord
Notes in chordCm6 C - Eb - G - A
Dm6 D - F - A - B
Em6 E - G - B - C#
Fm6 F - Ab - C - D
Gm6 G - Bb - D - E
Am6 A - C - E - F#
Bm6 B - D - F# - G#
The intervals are 1 – b3 – 5 – 6
Movable minor 6th chord
The Minor 6th can be played as a barre chord. The diagram below shows a barre shape with the root note on the 6th string and based on the Em6 shape.
To play, for example, F#m6 the short notation is: 244242.
Here is one chord sequence in the key of G that include a minor 6th:
G - Dm6 - E7 - Am7 - D7 - G
Notice that the Dm6 fits well before E7 since both include a B note, which for example Dm doesn't.