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I don't know about "official," but the changes I've always used for SM have been (shown here in G):
G7 / / / | C7 / / / | G7 / Ab7 / | G7 / / / |
C7 / / / | C7 / / / | G7 / Am7 / | Bm7 / Eb9 / |
D7 / / / | Eb7 / D7 / | G7 / C7 / | G7 / D7 / ||
There are lots of variations, especially turnarounds for the last two bars, but these changes should get you through most blues jams. Best of luck, CS
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