For example, if you select the key of A you can see that you will be choosing from the chords A, D, E, and G#dim* (Major chords) and Bm, C#m and F#m (minor chords). Each has a Roman numeral (I, ii, iii, IV, V, vi and VIIº) depending on where in the scale it is. Why bother with Roman numerals? Surely the name of the chord says it all. Actually, it's very useful because the Roman numerals show common patterns that songs in all keys follow.
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