It would take way too long for you to understand this completely. But, for short term... Blues is usually played in the keys of E, A,and D. There are plenty of songs in the keys of G, C, and F too. Most blues songs follow the 1-4-5 music theory. the one is represents the key a song is in. SO if a song is in the key of E... 1 2 3 4 5 6 7 E F G A B C D The one is E, the four is A, and the five is B. "bending the seventh" I think, is a reference to taking any chord, adding the seventh note, and bending it. (pulling or pushing on the string to create more tension and create a different note) Delta blues in particluar uses alot of open and dropped tunings in order to achieve alternating bass rhythms. Check out Son House, Charlie Patton or Lightning Hopkins for the best examples.... Good luck Spartacus
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