The rhythmic feel and micro-timing character of a track that makes listeners want to move, created by the interplay of drums, bass, and percussion and any intentional swing or humanization.
Groove is the overall rhythmic feel of a track, determined by how its drum, bass, and percussion elements interact with each other in timing and emphasis. It encompasses both the written pattern and the micro-timing deviations, such as swing or intentional early/late placement of certain hits, that give a track its sense of push, pull, or bounce.
Why it matters
Groove compatibility between two tracks is distinct from BPM compatibility. Two records can share the same tempo but feel rhythmically mismatched if one has a heavy swing or a displaced backbeat while the other is straight and quantized. When the grooves are incompatible, a technically beatmatched blend will still feel unsettled.

