Here is a classic double stop lick from the original old time blues legend Chuck Berry. The key to this lick is an early hit, just a hair before the 1st and 3rd beat that invokes a “push-shuffle” feel. The first lick is over the Bb7 chord, or I chord in Bb blues and features a full bend. The second double-stop is for the Eb7 chord or IV chord and features a half bend that lands on the major 3rd.

Check out Chuck’s great solo in his live version of Johnny B. Goode, he starts at 1:39 and you can hear the first I chord lick as he duck steps across the stage. You can also hear the IV chord lick as he does some interesting dance moves at around 2:01.