Bass Basics: How to Build Great Bass Lines

The bass has two jobs at once: it tells everyone which chord is happening (harmony) and it tells everyone where the beat is (rhythm). A great bass line is usually not the busiest one. It is the one that makes the band feel solid. This lesson gives you a toolkit that works in almost any style: roots, fifths, octaves, approach notes and a first walking line.

The 4-string bass layout

A standard 4-string bass is tuned E1 A1 D2 G2, from the thickest string to the thinnest. These are the same note names as the four lowest guitar strings, but one octave lower. Each string is a perfect fourth above the previous one, so the neck is perfectly regular: every shape you learn can be moved to any string set and any fret.

In bass tablature the bottom line is the 4th string (low E) and the top line is the 1st string (G). Each fret raises the pitch by one semitone, and the 12th fret gives you the open string an octave higher.

Two facts make the neck easy to navigate:

• The note at the 5th fret of a string is the same as the next higher open string (5th fret of E = open A).
• The octave of any note is two strings higher and two frets higher (A string fret 3 = C, G string fret 5 = C).

Step 1: Roots

The root is the note that gives a chord its name: C for C major, A for A minor, G for G7. Start with a simple progression and play the root on every quarter note.

For C, Am, F and G, a compact set of roots is: C at A-string fret 3, A on the open A string, F at E-string fret 1, G at E-string fret 3.

Step 2: Fifths and octaves

Once roots feel steady, add the fifth and the octave. These two notes belong to both major and minor chords, so they always fit, whatever the chord quality.

• Fifth above: one string higher, two frets higher than the root.
• Fifth below: same fret, one string lower (if a lower string is available).
• Octave: two strings higher, two frets higher.

Here is the classic root-fifth-octave-fifth pattern on a C chord, followed by the root-to-lower-fifth pattern:

Because the bass neck is symmetrical, this shape works for any root on the E or A string. Move the whole pattern up two frets and you are playing over D; move it to the E string at fret 3 and you are playing over G.

Step 3: Approach notes

An approach note is a note played just before a chord change that leads the ear into the next root. It is usually placed on the last beat (or last eighth note) of the bar. There are three main types.

Chromatic approach

Play the note one fret below or one fret above the next root. Going from C to F, play E (one semitone below F) or F# (one semitone above) on beat 4. Chromatic approaches create a strong pull because a semitone is the smallest step in Western music.

Scale approach

Use the note of the key that is one step away from the target. In C major, going from C to F, you can play G on beat 4 (one step above F) or E (one step below). This sounds smoother and more "inside" than a chromatic approach.

Dominant approach

Play the fifth of the target chord just before it. To approach F, play C (the fifth of F); to approach G, play D. This is the same pull as a V to I cadence in miniature, and it sounds strong and confident.

Step 4: Locking with the kick drum

The bass and the kick drum are a team. When your notes start at the same moment as the kick, the groove feels powerful and tight; when they disagree, the band sounds messy even if every note is correct.

• Listen to the kick pattern first. Count where it lands: beat 1 only? Beats 1 and 3? An extra hit on the "and" of 2?
• Match the kick with roots. Play the root wherever the kick plays. Fill the gaps with fifths, octaves or rests.
• Respect the snare. Beats 2 and 4 usually belong to the snare. Short notes or rests there give the groove space.
• Control note length. Ending a note on time is as important as starting it. Mute with your fretting hand by lifting pressure, or rest a plucking finger on the string.

Practice with a drum loop or a metronome set to beats 1 and 3 only, as if it were a kick drum.

ToolsOnline MetronomeAccurate browser metronome with tap tempo, accents, time signatures and subdivisions.

Step 5: A first walking bass line

Walking bass moves in steady quarter notes, usually one note per beat, with a different note almost every beat. A simple recipe for each bar:

1. Beat 1: the root of the chord.
2. Beats 2 and 3: chord tones (third, fifth) or scale steps.
3. Beat 4: an approach note into the next root.

Here is a walking line over C, Am, Dm, G7 (I vi ii V in C), one bar per chord:

Bar by bar:

• C: C, E, G (the C triad), then G# as a chromatic approach from below into A.
• Am: A, G, E, then C# as a chromatic approach from below into D.
• Dm: D, F, A (the Dm triad), then Ab as a chromatic approach from above into G.
• G7: G, B, D (the G triad), then Db as a chromatic approach from above back to C.

Play it slowly, loop it, and listen to how every bar points to the next. Then try replacing the chromatic approaches with dominant approaches : on beat 4 of the Am bar, play A instead of C#, because A is the fifth of D; on beat 4 of the Dm bar, play D, the fifth of G; on beat 4 of the G7 bar, play G, the fifth of C.

Common mistakes

• Playing too much. Fills on every bar crowd the music. Keep fills for transitions between song sections.
• Ignoring muting. Open strings ringing under your notes muddy the low end. Mute unused strings with the side of the fretting fingers or the plucking thumb.
• Not knowing the chord quality. Fifths and octaves always fit, but the third does not: use E over C major, Eb over C minor.

Practice

1. Roots on the beat: play the I vi IV V progression in C with quarter-note roots at 70 BPM for two minutes without stopping.
2. Root-fifth-octave: play the pattern on every root of the same progression, staying in one area of the neck.
3. Approach drill: play roots for three beats and a chromatic approach on beat 4. Then repeat with scale approaches, then dominant approaches.
4. Kick lock: set the metronome to sound only on beats 1 and 3 and play roots exactly with each click.
5. Walking line: learn the walking line above, then write your own on tab paper over the same chords.

Related lessons: Reading tab, Triads, Chord progressions, Diatonic harmony, Guitar tuning, Practice method.

Tools: Scale explorer, Fretboard trainer, Metronome, Progression player.

Exercises: Bass chromatic, Root and fifth, Octaves, Bass arpeggios, Walking ii-V-I, Bass fretboard 1.

Printables: Bass tab paper, Bass fretboard notes, Blank bass fretboard. Follow the full 30-day bass beginner path.