So I didn't update yesterday, I know, I know. To make it up for it, I'll bring you TWO updates today. Yay!
First up: Trevor, better known in the YouTube world by quaz18, explains some theory in his pretty blue Musicman bass guitar. In order, he covers the basics of pentatonic scales, modes and mayor and minor scales (relative minor to mayor included).
The volume is a bit low, so you might want to crank it up a bit.