Here is a great example of using the "unison slide". Sliding on the D string up to the 5th fret and playing the open G right after. It's a classic bluegrass move. Sliding from the 3rd fret gives a bit more of a bluesy flair than sliding from the 2nd or 4th fret.
Any time the melody note use an open g this can be a good substitute lick. Check out Ain't Gonna Work Tomorrow - Bluesy to hear this one in action.
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