Watch the Kickin Mule online guitar lesson by Robbie Calvo from The Rhythm Architect

I didn't want to lose the low end edge I'd created with the first guitar foundation, so my riff based idea is in the same frequency range on the guitar but utilizes more single notes.

For the adventurous ones among you, take the single note ideas and play them an octave above where they reside now. You probably won't get the open string an octave up, so you'll need to fret that note!