A half-time feel moves the backbeat. Instead of snare on 2 and 4, you play snare only on 3. The pulse hasn't changed — the metronome is still clicking at the same tempo — but the groove suddenly feels half as fast, because the listener perceives the snare hits as the backbeats and there's now only one of them per bar. A 4-bar phrase ends up feeling like a 2-bar phrase that's been stretched out.
Half-time is the rock drummer's tempo-inflation device. You hear it under chorus drops in arena rock (when the band wants to feel huge without slowing down), under bridges in pop-rock, and as the default groove in most hip-hop-influenced rock. The "Fool in the Rain" / "Forty Six & 2" approach: same BPM, half the apparent speed.
- The kick should feel sparser, not faster. Don't compensate for the missing snare by stuffing kicks underneath. Let the bar breathe.
- Hi-hat subdivision can stay where it was (8ths or 16ths) — the snare displacement does the work.
- The transition is the hard part. Going from full-time to half-time has to land on the downbeat of the new section. Practice the change explicitly.