I'm embarrassed to admit my understanding of chords and chord construction is still wobbly. I think the answers lie in key signatures ("memorize ACOCA!" my friend says emphatically) and the pattern of major and minor scales. They are foundational concepts in music theory and I've only glossed over them.
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Meditation Time meditating today: nil Quality of meditation (out of 10): 0
Practice Minutes on the keyboard today (out of 40): 20 minutes Quality of practice (out of 10): 6