The Groove is music.nw’s own measure of renown — not an opinion, a fact computed from the record. It weighs reach (how many people engaged) against acclaim (how highly they rated it), balanced so a handful of votes can’t outshout a lasting favourite.
Computed the NeuraWeb way, across the whole record. The same yardstick for everyone — which is why the little-known can out-Groove the famous in their own corner.