Boom-chick is a two-feel: the bass lands on beats one and three (the "boom"), and the guitar answers on two and four (the "chick"). Nothing else in country music is older or plainer, and almost every other groove on this site is a variation on it. Below is the exact one-bar cell each chair plays, over the three-bar tonic-subdominant-dominant frame in the key of G.
| Chair | 1 | & | 2 | & | 3 | & | 4 | & |
|---|---|---|---|---|---|---|---|---|
| Bass | 1 | — rest | — rest | — rest | 5 | — rest | — rest | — rest |
| Guitar | D | — rest | U | — rest | D | — rest | U | — rest |
| Mandolin | — rest | — rest | chop | — rest | — rest | — rest | chop | — rest |
| Banjo | roll | roll | roll | roll | roll | roll | roll | roll |
| Fiddle | sustain | — rest | — rest | — rest | — rest | — rest | — rest | — rest |
| Dobro | — rest | — rest | — rest | — rest | — rest | — rest | — rest | run |
| Lap Steel | sustain | — rest | — rest | — rest | — rest | — rest | — rest | — rest |
| Pedal Steel | sustain | — rest | — rest | — rest | — rest | — rest | — rest | — rest |
| Piano | sustain | — rest | — rest | — rest | — rest | — rest | — rest | — rest |
Read the bass row as a chord-tone DEGREE, not a chord number: 1 is the root of whichever chord is sounding that bar, 5 is its fifth. Realized over the three-bar frame — G major, then C major, then D major — the bass actually sounds:
| Bar | Chord | Beat 1 (degree 1) | Beat 3 (degree 5) |
|---|---|---|---|
| I | G | G (open string) | D (open string) |
| IV | C | C (fretted) | G (open string) |
| V | D | D (open string) | A (open string) |
Five of the six bass notes across this frame ring one of the four-string bass's own open strings (E-A-D-G) — only the C on the IV bar needs a fretted finger. That is not a coincidence of this particular key: it is why G-C-D is the frame the guitar chair's own open shapes are built around too (see keys and capo), and it is exactly the kind of fact a chord chart never states because a chord chart does not know which chair is playing the bass note.
No chair rests entirely in this groove — that distinction belongs to the train beat, where the dobro sits out a full bar. Here every chair has at least one onset: the fiddle's single sustained pad is still a part, not a rest, because a held tone is a declared choice about what NOT to play underneath it. The dobro's solitary fill lands on the last eighth of the bar — the pickup — answering into the next bar rather than commenting on this one. The lap steel's row reads like the fiddle's and the piano's, one chord held from the top of the bar, and the difference is in how it gets there: a steel's chord is a bar slid onto a fret rather than a hand shape pressed down, so it can lean into place from a fret away as it sounds. The pedal steel's row is the same held chord, and its difference is the bar line: when the frame moves from G to C to D, a pedal steel usually leaves its bar where it is and lets a foot or a knee retune the ringing strings into the next chord — the pedal moves its own key pages draw.
The banjo is the one chair that never stops. A two-feel puts its weight on the beats and leaves the eighths between them empty — the bass is silent on every "and", and so is the guitar — and the banjo's roll is what fills them: thumb, index and middle picking through the chord one string at a time, a single note on every slot of the bar. It is not a louder part than the others, and on a record it usually sits low; it is the chair that turns a plain boom-chick into something that sounds like it is moving forward. Because every note is picked rather than strummed, it adds motion without adding another chord hit on top of the guitar's.