In this guitar lesson we check out a Chuck Berry style lick that uses thirds. Really the lick is just a vehicle for you to learn how to use them in your blues and rock playing. Tab is on the web site innit.
Full support at the justinguitar web site where you will find hundreds of lessons on a wide range of subjects, and all the scales and chords that you will ever need! There is a great forum too to get help, no matter what the problem.
And it is all totally free, no bull. No sample lessons, no memberships. Just tons of great lessons :)
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Have fun :)