Watch the Symmetrical Scales: 4 Notes online guitar lesson by TrueFire from Play Rock Guitar 9: Advanced Lick Vocabulary
Symmetrical Scales: 4 Notes - Demonstration is a video guitar lesson presented by Oz Noy and is sourced from Improv Wizard.
Now I'll show you the 4 note per string version of the F major symmetrical scale. By sliding the first note per string of the three note version, we can reach the fourth note and spread the scale out on the neck. This will open up the neck horizontally, covering the neck completely by reaching the scale's fourth degree.