12 bar blues shuffle in The double notes are actually triplets played with this rhythm: |x-xx-xx-xx-x|x-xx-xx-xx-x| G|--------|--------|--------|--------|--------|--------| D|--------|--------|--------|--------|-225522-|-225522-| A|-225522-|-225522-|-225522-|-2255223|3------3|3-------| E|3------3|3------3|3------3|3-------|--------|-------3| G|--------|--------|--------|--------|--------|--------| D|--------|--------|-447744-|-225522-|--------|--------| A|-225522-|-2255225|5------3|3-------|-225522-|-225522-| E|3------3|3-------|--------|-------3|3------3|3------3| That is the basic structure of the song. You can improvise with these runs to move from one chord to the next: G|--------|--------|--------| D|-----225|53322---|-225522-| A|-2255---|-----553|3------3| E|3-------|--------|--------| G|--------|--------|--------| D|--------|--------|-225522-| A|-225522-|-0011223|3------3| E|3------3|3-------|--------| G|--------|--------|--------| D|-----225|522-----|-225522-| A|-2255---|---55223|3------3| E|3-------|--------|--------| G|--------|--------|--------| D|--------|--------|-447744-| A|-225522-|-2233445|5-------| E|3------3|3-------|--------| G|--------|--------|--------| D|-----225|522-----|-225522-| A|-2255---|---55225|5------3| E|3-------|--------|--------|