Circle of Fifths .... there is an App for that and it is not bad. It is $.99 ... Animated two rings where you can spin either ring to match chords with I ii iii IV V vi vii (Major and minor). I think it is a pretty neat piece of handy theory. You rotate either ring to change the key. Can also change the Mode (that is above my pay grade, however. I'm kind of a Ionian guy ... Am I missing out on something?).
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