What it is
For any chord, play the root note on beats 1 and 3, and the perfect 5th on beats 2 and 4. The 5th of any chord lives one string up, two frets higher than the root (or one string down, same fret — the lower 5th).
Example over a C chord (root on A string, fret 3):
A string: 3 . 3 . 3 . 3 . (root = C)
D string: . 5 . 5 . 5 . 5 (5th = G)
Why it matters
Country, bluegrass, folk, lots of rock, and early R&B basslines run on this pattern. It turns "I know one note per chord" into a real bassline instantly, and it builds your ear for the root-5 relationship.
How to practice
- Pick a song with simple chords (three-chord country is perfect). Play root-5-root-5 through the whole song.
- Practice the shift: C chord root-5, then F chord root-5, then G.
- Add the lower 5th variation: same string, but the 5th is two frets down from the root on the same string (e.g. root C at A string fret 3, lower 5th F at E string fret... wait, that is the 4th). The lower 5th is actually on the string below, same fret: E string fret 3 = G. Use it when it keeps your hand in one position.