During the last couple of meetings Jim has shared some of what he knows about 12 Bar Blues and 'Chord Progressions' in general. I thought it would be useful to summarise it using his material and what I think I have learned. A "Key" consists of 7 different 'triad' chords. In 'chord progressions' these 7 chords are identified using Roman Numerals, so we have I, ii, iii, IV, V, vi and vii. As shown in Table 1, the Key of C includes the chords C, Dm, Em, F, G, Am and Bdim. Table 1 also shows all the chords for the rest of the Natural (no flat or sharp) Major Keys. Table 1 12 Bar Blues progression If we use the example of 12 Bar Blues Chord Progression, shown in Grid 1 below, we need to use the chords I, I, I, I, IV, IV, I, I, V, IV, I and lastly I or V. Now Using Table 1 In the key of C this means 12 bars using chords C, C, C, C, F, F, C, C, G, F, C and lastly C or G In the key of D this means 12 bars using chords D, D, D, D, G, G, D, D, A, G, D and lastly D or A Grid 1 That's it as far as Jim's talk goes but, there are other common progressions, some of which Jim mentions at the bottom of Table 1 which I had clipped off: In addition to the Natural Major keys in Table 1 there are also minor keys, and in each there are flat and sharp keys, as in tables below, borrowed from www.piano-keyboard-guide.com Table 2 Table 3
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