James Brown's band redefined what a rhythm section was for. Where most popular music up to that point treated rhythm as accompaniment, Brown's band treated rhythm as the whole arrangement — every instrument, vocals included, became a percussion part contributing to a single interlocking pulse. The drummers in that band — primarily Clyde Stubblefield and John "Jabo" Starks, with several others passing through — developed a vocabulary that's still the lingua franca of funk drumming sixty years later.
The defining principle of JB drumming: everything is on the One. Brown himself would shout it on stage. The downbeat of every bar is the gravitational centre, and every other note — kick, snare, ghost, fill — orbits it. A JB groove that has lost its sense of the One isn't a JB groove anymore.
Clyde and Jabo are often discussed together but they had different feels. Clyde played busy, ghost-note-dense, 16th-heavy patterns — closer to what we built in funk-clyde-stubblefield. Jabo played sparser, more "upright" grooves with cleaner lines and bigger pocket. Both work. Many recordings are debated among drummers as to which one is on the kit. For practising, alternate between dense (Clyde) and sparse (Jabo) versions of the same skeleton; this gets both feels under your hands.
JB grooves don't exist in isolation. A signature feature is the ensemble hit — a horn or guitar stab on a specific 16th that the drummer either reinforces (with a kick or snare) or leaves bare (so the band hits it together while the drummer continues the underlying groove). The exercises below include a pattern where a hypothetical horn hit lands on a specific 16th — your job is to keep the underlying groove going while "hearing" the hit as if the band were there.