Take a look at the example song, “Knockin’ On Heaven’s Door,” at the end of our CAGED lesson.
Bar 2 requires an A minor chord. In that example, I took the G chord shape:
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And moved it up a whole step to become A major:
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Then flatted the major third (C#) to become a minor third (C):
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The above is now an A minor chord.
This shows how you can alter the major chord shapes to become minor. You’ll need to make these alterations if it’s called for in the music.