Sliding your fingers on a guitar string is one of the many ways to add flavor to your blues guitar sound. To do a string slide, put your finger on a string and let it glide through until you stop at another fret location. For example (Fig. 1):
You can also do a string slide going backward rather than forward the higher registers of the guitar fretboard. For example (Fig. 2):
You can slide from, say, fret 3 to fret 15 on the same string, forward or backward. The only limitations to where you want to stop when sliding your fingers on the strings are the fretboard and the blues guitar scale you are playing.
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