G major works nicely but when it go's to the Cmajor chord think of the F# in the G major scale as note to avoid (at least don't hold onto it) You can use it very effectivily as a transistional note. A note that "takes" you to the note below ..(the note below being F) or above (being G) both of which sound good. The F sounds jazzier as it is a fourth in the C chord
scheme and the G sound wholesome and strong as a fifth in its relationship with C
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