Junior Murvin was a falsetto singer who worked with producer Lee “Scratch” Perry at his Black Ark studio off and on during the 1970s. One result of his efforts was this outstanding roots reggae document, one that had a surprising impact in other genres as well — it’s worth noting that the title track was covered by the Clash on their debut album. Murvin’s voice is a combination of ethereal beauty and declamatory power: when he takes Babylon to task on tracks like “Rescue Jah Children” and “Lucifer,” or asserts his spiritual bona fides on “I Was Appointed,” it’s impossible not to pay attention. His musical vision and prophetic posture are only intensified by Perry’s unique production style.