Modal jazz changed what comping is for. When the chord stays the same for sixteen or thirty-two bars (think "So What" — D-7 for sixteen bars, then E♭-7 for eight, then D-7 again), the harmonic information is gone. The drummer's job stops being to articulate chord changes and starts being to generate energy across long, harmonically static stretches.
Elvin Jones with Coltrane is the textbook. The ride pattern stays in motion, but the kick and snare start participating in a rolling 8th-note triplet feel — kicks and snare hits land on the second or third partial of the triplet group, creating a constant sense of forward motion that doesn't depend on harmonic change to push the music. The whole texture becomes one rolling wave.
- Triplet kicks — the bass drum lands on triplet partials, often the second or third of the group, weaving with the ride.
- Snare-and-hat building — the hi-hat hand opens up to a wash, the snare adds intermittent comments. Density increases bar by bar.
- The arc — every 4-bar phrase has a contour. Start sparse, build, peak, release. The release is what makes the build mean something.