What it is
Knowing, without thinking, the name of the note at any fret on the E and A strings. The natural notes (no sharps/flats) are the anchors:
- E string: E (0), F (1), G (3), A (5), B (7), C (8), D (10), E (12).
- A string: A (0), B (2), C (3), D (5), E (7), F (8), G (10), A (12).
Everything in between is a sharp/flat of its neighbor.
Why it matters
Bass lines live on the E and A strings more than the D and G. If you can instantly find any root note down there, you can play almost any song by following the chord changes.
How to practice
- Open the fretboard explorer, pick "All notes" and hide every control.
- Name test: pick a random fret on the E string and say the note out loud before looking. Start with natural-note frets only.
- Find test: name a random note and place your finger on the first fret it appears on either E or A. Work toward under 3 seconds.
- Do this for 5 minutes a day. It is boring. That is how you know it works.