Watch the Putting It All Together online guitar lesson by Dave Celentano from Classical Concepts for Rock Guitar
Learn "Invention In D Minor" four measures at a time as shown in the video. The first two measures can be repeated several times making a superb exercise developing the volume swell and echo techniques (and it sounds real cool too). Interestingly, the piece ends on an F note, which is the root of the relative major key. This is a writing tool Bach and other composers occasionally used.