Jazz Ex 19 For this 3/4 example in G we are thinking ‘D minor pentatonic’ for the I7 chords, which is a handy way of playing a minor pentatonic scale in a Mixolydian context, such as a dominant 7th chord. For the IV7 (C7) we can think ‘G minor pentatonic’ - in other words the minor pentatonic scale starting from the 5th of the dominant 7th chord. Try experimenting with your thumb to strum the octaves (Wes Montgomery style), paying extra attention to muting with your fretting hand fingers to prevent unwanted notes from ringing.
Jazz Ex 20 This final jazz example is in C, although in standard jazz fashion it moves away from the diatonic chords of C major. Again we play the minor pentatonic scale that starts on the 3rd of each major chord. In other words, we are using E minor pentatonic (Cmaj7 chord), A minor pentatonic (Fmaj7 chord), G minor pentatonic (Ebmaj7 chord) and C minor pentatonic (Abmaj7 chord).