Programming Odd Meters: Grouping, Accent and Grid
Odd meters are built from grouping and accent; a missing beat only gives you a limping 4/4.
Related
The time signature is a label; the grouping is the music
Delete one beat from 4/4 and you get a limping 4/4, not 7/8. Odd meters are heard through their grouping: 5/4 runs 3+2 or 2+3, 7/8 runs 3+2+2 or 2+2+3, 5/8 usually runs 2+3, and 11/8 usually runs 2+2+3+2+2. Change the grouping of the same string of eighth notes and the accents, the dance step and the bass landing points all change. Count it aloud before writing anything; a grouping your mouth cannot follow will not flow in the piano roll either.
The denominator decides how to count
Count 7/8 and 5/8 in eighth notes, and 5/4 and 7/4 in quarter notes. The top number can match while the bottom one changes, so the counting method cannot be shared. State the tempo unit as well: a 120 BPM marking in 7/8 may refer to the quarter or the eighth, a factor of two in real speed. When talking to a drummer or an arranging partner, writing 3+2+2 is more useful than writing 7/8, because the grouping tells them where the weight goes.
Common groupings and where they land
| Meter | Grouping | Accents | Common source |
|---|---|---|---|
| 5/4 | 3+2 | 1, 4 | Balkan dance, prog rock |
| 5/4 | 2+3 | 1, 3 | Narrative sections, slow riffs |
| 5/8 | 2+3 | 1, 3 (eighths) | Paidushko |
| 7/8 | 3+2+2 | 1, 4, 6 (eighths) | Balkan horo |
| 7/8 | 2+2+3 | 1, 3, 5 (eighths) | Folk, film score |
| 11/8 | 2+2+3+2+2 | 1, 3, 5, 8, 10 (eighths) | Kopanitsa |
Grouping is not fixed for a whole piece: a section can switch from 3+2 to 2+3, and the feel turns from long-short to short-long at once. Write the grouping next to the time signature; it saves a row of accent marks added after the fact.
Grid, loop length and quantise
Set the meter before the grid: 5/4 works on quarters or eighths, 7/8 and 5/8 on eighths, and 11/8 may need sixteenths to draw the detail. Set loop length in bars. One bar of 7/8 is seven eighths, and building it from seconds will drift at the seam. Put the kick on the first beat of each group and the snare on the head of the second or third group; leaving a gap is easier to count than filling every slot. Keep some quantise strength in reserve, because snapping everything flat makes the grouping sound like a metronome. If the take was played in 4/4, change the meter and play it again; quantising only locks the wrong accents in place.
Where it breaks
In dance music, advertising and children's songs, an odd meter leaves listeners without a foothold unless the grouping itself becomes the hook. Notating 7/8 as 4/4 plus a rest looks fine in the edit and loses the drummer on stage. Mark the tempo unit wrongly and the DAW and the score end up a factor of two apart. The most common failure is a 5/4 played as 4/4 plus a rushed beat: after quantising it sounds tidy, while the accents stay wrong throughout.
Listen in the library
All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).
Along the same line
Sources
- Cooper & Meyer, The Rhythmic Structure of Music（节奏结构教材）
- Kostka, Payne & Almén, Tonal Harmony，拍号与非对称拍章节（和声教材）
- Ableton Live 用户手册，拍号、节拍器与网格设置（软件文档）