Bass Scales: The Four Shapes That Cover Most Songs

Guitarists learn scales to solo with. Bassists learn them for a different reason: to know which notes are safe between the roots. That difference changes which scales are worth your time and how you should practise them.

Four shapes cover the overwhelming majority of recorded bass parts. Learn them in this order.

1. Minor pentatonic — learn this one first

Five notes, no wrong ones. The minor pentatonic is the source of an enormous share of rock, blues, funk, and metal bass lines, and it is forgiving in a way the full seven-note scales are not: there is no half-step clash waiting to bite you.

From a root on the E or A string, the shape is compact enough to play without shifting position. Root, then three frets up; on the next string, root position and two frets up; repeat. Because it sits under one hand, it doubles as a fretboard-navigation exercise.

The A minor pentatonic page has the fretboard diagram; the shapes are the same on bass, just an octave down.

2. Major scale — the reference everything else is named against

You will not build many bass lines directly from the major scale, but you need it as a measuring stick. “Flat third,” “fifth,” and “flat seventh” are all descriptions relative to it, so without it the vocabulary other musicians use on stage does not mean anything.

Practical payoff: the major scale contains the notes of the chords in a key. If a song is in G, the notes of G major are the ones that will not sound wrong.

3. Natural minor

The same notes as its relative major, started in a different place, and the home of most minor-key rock and pop. Once you know the major shape, this costs you almost nothing — start on the sixth degree and you are already playing it.

4. Blues scale

The minor pentatonic with one chromatic note added between the fourth and fifth. On bass that note is a passing tone, not a destination: land on it and the line sounds unresolved, pass through it and it sounds like a bass player. That distinction matters more on bass than on guitar, because your notes carry the harmony.

How bassists should practise scales

Running a scale up and down is nearly useless for bass, because songs never ask for that. Two better drills:

Roots and thirds. Play the root of each chord, then the third from the scale, in time. This trains the connection between a chord symbol and a note choice, which is the actual job.

Target practice. Pick a chord change and land on its root exactly on beat one, approaching it from a scale note a step above or below. Approach notes are what make a walking line sound intentional, and they are the whole reason to know the scale at all.

Both drills are more useful with something checking your notes. Bass runs across 4 of the 9 arcade trainers in Guitar Quest, which listens through your microphone and detects bass pitches down to E1.

What about modes?

Later, and probably less than you have been told. Modes matter when you are choosing the character of a line over a static chord, which is a jazz and fusion problem more than a rock one. If you want them, the mode library covers all seven with fretboard diagrams — but finish the four shapes above first.

Related reading

• Bass Guitar for Beginners: What to Learn First
• Bass Guitar Notes: How to Find Any Note on the Fretboard
• Guitar Scales for Beginners