Minor Chords are staple in all sorts music including jazz and world music. A minor chord is when you stack the intervals 1, b3, and 5 (C, Eb, and G, if we are in the key of C) and a 6 or a b7 (A or Bb) to make it a Minor 6 or Minor 7 chord. I've included a fretboard diagram that shows how it is built on the fretboard and a useful shape you can add to your playing. I've also a video of my arrangement of the jazz standards "Summertime" and "Four On Six" to give you an idea of how these chords sound.
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