Watch the Making Thirteens online guitar lesson by Dweezil Zappa from Dweezology: Phrase Generators
On to thirteens! It's going to get a little bit tricky here because we're going to have to change up our form slightly to accentuate the feel of the thirteens. We're essentially adding together two groups of five (1-2+1-2-3), and adding three notes on top of that. It ends up being 1-2+1-2-3+1-2+1-2-3+1-2-3.