Here are some interesting turnarounds, all referenced to the key of G:
G7 - E7 - A7 - D7 - G7
G13 - E7#9 - A7 - D7sus - G7 (common note G)
G - Em7 - Am7 - D7 - G (famous 1-6-2-5)
Gmaj7 - Em7 - Ebmaj7 - D7sus4 - G
Bm7 - E9 - Am7 - D9 - G
Bm7 - E7b9 - Am7 - D7b9 - G (compare to one directly above)
Bm7b5 - E+7#9 - Am7b5 - D+7#9 - G
G - Bb13 - A7 - Abmaj7 - G (common note G, descending bass line)
Bm7 – Bb9 – Am7 – Ab9 - G (descending bass line)
G - Abdim - Am7 - D7 - G (ascending bass line)
G - Bb13 - Eb9 - D9 - G
G - Bb13 - Ebmaj7 - D+7 - G
G7 - C9 - G7 - D9 - G7
The next one is special. It obviously has a chromatically descending bass line, but the top note in each chord should be: B, C, A, Bb, B, respectively.
F(b5) - E+7(b9) - Eb(b5) - D+7(b9) - G(maj7)
Please add to the list with your cool turnarounds.
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