I wanna talk about the basics of rock music. Rock music is often based on very simple harmonies and very simple rhythms used in infectious ways. The driving beat is really what makes rock music rock music. Harmonically the rock music is based on minor pentatonic scales. What I was just playing was based on the E minor pentatonic scale. You have E, G, on the third fret, A on the fifth fret, B at the seventh fret. D on the fifth fret of the A string, and E on the seventh fret of the A string. If you think about it, just looking at the shape of the bass guitar neck, it's built for songs like this. For chords like this. If you just follow the dots up the neck, you get these sounds. Just by following the dots.