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Try the using lydian flat 7 scale - for a G7 chord it would be G, A, B, C#, D, E, F
You have to be careful with the C#, but it's a cool jazzy sound. When you switch to the C you have to move the scale so that it starts on C (C,D,E,F#,G,A,B flat). It almost works better over the C.
I also like the diminished whole step/half step scale for the IV chord in a blues.
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