Cm(maj7) chord on electric guitar
Cm(maj7) is the minor major seventh chord: C, Eb, G and B (1–b3–5–7). On electric guitar, the diagram shape is x 3 1 0 0 3, with C in the bass.
On the electric guitar a chord needs only a few clear notes — the amp sustains them and fills the space, so you mute the strings you are not playing and let the tone carry the rest. In this Cm(maj7) voicing the bass is C and the shape runs from fret 1 to 3, ringing 2 open strings. Plugged into an amp, each chord sustains for as long as you hold it, and the tone — clean or driven — shapes the whole sound.
Notes and formula of Cm(maj7)
Notes in Cm(maj7): C – Eb – G – BFormula: 1 – b3 – 5 – 7In the formula, the numbers count steps of the major scale starting from the note that names the chord; "b" lowers a half step, "#" raises one — and a slash names the bass note.
Where to use it
This is the classic suspense chord from spy movies — few notes, lots of atmosphere. It also opens the famous inner-voice trick that walks down one half step at a time: AmAmAmAm → AmMaj7 → Am7Am7Am7Am7 → Am6.
See also
Part of the Sevenths family.