"Dub plate inna session!", Johnny Osborne proclaims on the opening track, riding the ubiquitous Armagideon Time riddim into irie-ites territory. From there, Jammy's roots only get deeper, as Hugh Mundell, Michael Rose, Junior Reid, Barry Brown, Noel Phillips, Lacksley Castell, and the Fantalls all step up to the echo chamber and deliver some sweet singer's styles-roots with quality, seen? Of course, several dub versions are included, along with extended showcase tracks, which confirm what you should already know: Jammy's the heartical dubmaster, second only to his spar King Tubby in the Jamaican studio engineer pantheon. Crucial!