Am7
Am7 is the easiest seventh chord on the instrument: five of its six available strings can ring open or be fretted with two fingers, and the open strings are doing most of the work.
根音 / root · 小三度 / m3 +3 · 纯五度 / P5 +7 · 小七度 / m7 +10
Chord library
Play the shape first, name the stack second.
2 entries, each with its interval stack in semitones, a fretboard diagram and a description of how it actually sounds.
Cmaj7
Cmaj7 in the shape every guitarist learns first: the low E string is not played, the A string takes the root at the third fret, the D string the third at the second, and the top three strings ring open.
根音 / root · 大三度 / M3 +4 · 纯五度 / P5 +7 · 大七度 / M7 +11