Watch the Piano Organ Boogie online guitar lesson by Matthieu Brandt from Chord Tricks For Electric Blues
When you want to lay low but still play some intense colors, you can target the tritone intervals of the dominant 7th chords you're on. The tritone interval between the major third and flatted 7th is the heart of the dominant 7th chord. It defines the chord even more than the root. This is a backup part an organ player or a piano player would play.