'Play On Mr. Music' by the Upsetter Revue featuring The Heptones, The Congos and Junior Murvin, had long been the Holy Grail for roots reggae connoisseurs, until RockaShacka issued it on a 10-inch EP. The result of an impromptu studio jam - captured on celluloid for Jeremy Marre's 'Roots Rock Reggae' documentary in May 1977 - the track celebrates the undeniable pull of Perry's musical artistry, with both musicians and onlookers enhanced by the uplifting qualities of a marijuana spliff. You can also enjoy the unreleased dub mix of the deep rasta tune 'Rejoice Jah Jah Children' by The Silvertones.