The difference between dub and instrumental reggae is a matter of production and philosophy, to the extent the styles can be distinguished. Andrew Bassie Campbell strays toward dub with his second release on the Californian Young Tree label. Over the course of a 15-hour session at Tuff Gong studios in Kingston, he and a few pedigreed musical partners (including Leroy “Horsemouth” Wallace and Earl “Chinna” Smith) laid down 11 instrumental tracks, three of which reappear in remixed form at the end of the record. Campbell’s beefy bass lines, not surprisingly, are the thread—or perhaps rope—that ties this shifty music together. “You and I” cries out for vocals, “Jamaica” brings on the good-time Caribbean cheer, and the “Move” remix explores extra-spacious headroom. Campbell’s music reflects and clearly reveres the ’70s dub revolution, paying tribute to the masters and employing a few of them to get the groove just right.