Watch the JAM: Combining Shapes online guitar lesson by TrueFire from The Indispensable Toolbox for Guitarists
JAM: Combining Shapes - Chords and Rhythm Demonstration is a video guitar lesson presented by Susan Mazer and is sourced from Hands On Guitar: Beyond Beginner.
First, download the chart for this lesson. Notice that it uses both the "E" and "A" shape barre chords. Remember to lift up your grip, but continue to keep your hand on the neck when you play. The strum is also different because it uses muted chords. This gives the tune a percussive driving feel.