Write grooves over songs

A chord chart is not a bass part. This page is a method for turning harmony + feel into a line the drummer can trust — and you can remember.

Original examples only. Use songs you own / charts you write. Pair with Play along (basslines) for the shared fretted-room charts, Pocket, Muting, and Western theory · chords.

What you need before you invent notes

  1. Chord chart — at least roots and bar lengths ( | G | Em | C | D | ).
  2. Tempo & meter — BPM and 4/4 vs 6/8 etc.
  3. Drum feel — where the kick/snare live (or a click with accents).
  4. Song job — verse vs chorus vs bridge (busy vs sparse).

No drummer? Use a metronome with a louder click on 1 (and 3 for rock). Sing the kick pattern out loud.

The writing ladder (always climb in order)

Do not skip steps. Each step adds one variable.

  1. Roots on downbeats — one note per chord, on beat 1 (and maybe 3).
  2. Root motion — make changes obvious: leap or step into the next root on purpose.
  3. Rhythm cell — assign a repeating groove cell (8ths, gallop, ghosts) that fits the kick.
  4. Chord tones — add 5ths / 3rds / 7ths on weak beats only if the groove still locks.
  5. Approaches — chromatic or scale steps into roots at bar lines.
  6. Fills — at most one short fill per 4–8 bars; return to the cell.

Worked example — same chart, three jobs

Chart (one bar each): G · Em · C · D in 4/4 @ ~90 BPM. Invented line — not a song quote.

A · Verse (sparse)

G|----------------
D|----------------
A|---------2------
E|-3-----0--------
   G       Em      C(wait)  …then D on next bar’s 1

Idea: roots on 1; leave air for vocals. On C you might wait until beat 3 or hold over.

B · Chorus (driving 8ths)

G|----------------
D|----------------
A|-----2-2-----5-5
E|-3-3-----0-0----
   G  G    Em Em   C…

Idea: paired 8ths locked to kick/snare backbeat. Mute between notes so it punches.

C · Breakdown (gallop cell on roots)

G|---------------------
D|---------------------
A|---------------------
E|-3-33-0-00-3-33-5-55-
   G     Em    C     D

Idea: same roots, metal drive cell from Gallop. Still one pitch center per bar.

Map the form

Write a one-line form map before notes:

Intro 4  | Verse 8  | Pre 4  | Chorus 8  | Verse 8  | Chorus 8  | Bridge 8  | Chorus 8  | Outro 4
  • Intro/outro — often simpler or more hooky; can preview the chorus root motion.
  • Verse — leave space; support lyrics.
  • Chorus — clearer pulse; maybe higher energy (8ths, octaves), not necessarily more notes.
  • Bridge — permission to change cell or register once, then reset.

Rule: change one thing when the section changes (rhythm cell or register or density) — not all three.

Write to the kick (not the guitar)

Guitar may strum on every 8th. You do not have to match that density.

  1. Tap the kick pattern on your thigh.
  2. Put bass attacks on those taps first.
  3. Only then add notes between kicks (ghosts or chord tones).

If guitar plays a syncopated riff, decide: lock with the riff (metal unison power) or lock with the kick and let guitar float. Both are valid — pick one per section.

Choosing notes over a chord

For a chord lasting one bar, safe palette:

  • Beat 1 — root (almost always).
  • Beat 3 — root again, or fifth, or octave.
  • & of 4 — approach into next bar’s root (half step below/above is classic).
  • Weak 8ths — ghosts (x) keep the right hand moving without new harmony.

Over G: notes G, B, D, F♯ (if Gmaj7 colour), and approaches F♯ / A♭ into G or A into Am, etc. Theory detail: chord tones · apply shapes on Scales.

Groove templates (steal the rhythm, invent the pitches)

Count aloud; swap in the song’s roots.

1 · Four on the floor roots

1 2 3 4 — root each beat. Punk / dance floor. Mute hard between.

2 · 1 and 3

Root on 1 and 3 only. Half the notes, twice the weight.

3 · 8ths with ghosts

1 & 2 & 3 & 4 &
R x R x R x R x

R = root, x = ghost. Funk/rock engine. See Muting.

4 · Anticipation

Hit the next chord’s root on the & of 4, then land again on 1. Creates push without rushing the bar.

5 · Pedal tone

Hold one low note (often tonic or dominant) while chords move above — metal / cinematic. Mute carefully so it does not turn to mush.

6 · Gallop cell on roots

From Gallop: one cell per beat, pitch = section root.

Finish checklist (before you call it done)

  • Can you sing the line while tapping the kick?
  • Do bar-line roots land clearly for a listener who cannot see the chart?
  • Is there intentional silence every few bars?
  • Does the chorus groove differ from the verse by exactly one design choice?
  • Would removing half the notes still work? If yes, try the thinner version.

Practice: write three parts this week

  1. Pick a progression you know (or I–V–vi–IV in G: G–D–Em–C).
  2. Write verse sparse + chorus driving (templates 2 and 3).
  3. Record both; keep the one that locks harder, not the one with more notes.
  4. Optional: add a bridge pedal tone for 4 bars, then slam back to chorus cell.

Hear the ladder on shared charts: Play along. Walking harmony lines: Walking bass. Metal drive: Gallop.

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Text twin: write-grooves.md