Rock in odd meters isn't fusion in odd meters. The phrasing has to remain recognisable — there's still a backbeat, still a riff, still a chorus. The drummer's job is to let an asymmetric meter feel like a groove rather than a math exercise. Pink Floyd's "Money" is in 7/4 but it never sounds like an experiment; Tool's "Schism" cycles through multiple odd meters and still feels like a song.
The technique is the same as it is in fusion odd meters: feel the meter as groupings, not as a count. 5/4 = 3+2. 7/8 = 2+2+3. 9/8 = 2+2+2+3. 13/8 = 4+4+3+2 or 3+3+3+2+2 depending on the band. Once the grouping is internalised, the meter stops being odd and starts being shaped.
Metric Modulation
The fourth exercise introduces metric modulation — a tempo-mathematical shift where a subdivision in one meter becomes the new beat in another. The 8ths of a 4/4 bar at ♩=100 become the quarter notes of a new section at ♩=200. Done well, it sounds like the band has changed gears smoothly. Done badly, it sounds like a car crash. We'll do a simple version: 4/4 to 5/4 with the quarter note staying constant.
Exercises
Feel five as 3 + 2, counting 1-2-3 / 1-2 out loud. Snares land on beat 2 (inside the three-group) and beat 4 (the start of the two-group). The three-group settles; the two-group lifts you back to the top. When the count disappears, it's a groove.
Seven 8ths per bar, grouped 2 + 2 + 3. Snare on the 3rd 8th (start of the second group) and on the 7th 8th (end of the long group). Kick on the 1st and 5th. Count 1-2 / 3-4 / 5-6-7. Don't speed through the long group — the 3 at the end is what makes the meter feel like 7 instead of like a clipped 8.
Nine 8ths grouped 2 + 2 + 2 + 3 — three short groups, then one long. Snare on the 3rd, 5th, and 9th 8ths. Count 1-2 / 3-4 / 5-6 / 7-8-9. The bar has the same shape as 4/4 plus an extra 8th tacked onto the end. Many prog tracks use 9/8 as exactly that: 4/4 with a hiccup.
Bar 1 of the modulation — a regular 4/4 rock bar at ♩=100. After this bar, the quarter note remains the same but the meter shifts to 5/4 (use Exercise 1 for the 5/4 bar). Practice these two exercises back-to-back as a single 9-beat phrase: four quarters of 4/4, then five quarters of 5/4. The metronome never changes; only the bar length does. That is metric modulation in its simplest form.