Holt, Burning Spear, Dennis Brown, Slim Smith, and scores of others. Sibbles was a contributor to tracks including "Freedom Blues" (which evolved into the Jamaican rhythm known as "MPLA") by Roy Richards, "Love Me Forever" by Carlton & The Shoes, "Satta Massagana" and "Declaration of Rights" by the Abyssinians, "Stars" and "Queen of the Minstrels" by The Eternals, "Ten to One" by the Mad Lads, "Door Peep (Shall Not Enter)" by Burning Spear, and the instrumental "Full Up", which was used by Musical Youth for their huge worldwide hit "Pass the Dutchie". Because of the Jamaican process of versioning and the liberal recycling of rhythms in subsequent years, many of the songs, rhythms, and melodies written and recorded during the rocksteady era, the aforementioned in particular, continue to be referenced today. The most frequently referenced of Sibbles' bass lines is that found on the instrumental "Full Up", popularised internationally by Musical Youth's recording of "Pass the Dutchie", an adaptation of Mighty Diamonds' "Pass the Kouchie". Sibbles' legacy also endures in Horace Andy's tribute to him, "Mr. Bassie". (While Sibbles has been credited with the original "Real Rock" bassline, this was more likely performed by Boris Gardiner). The bass parts Sibbles and others developed in rocksteady used a rhythmic space found in later roots reggae, where the notes were not necessarily played or sustained on each downbeat of a 4/4 measure. Sibbles has explained that his style was to lag the downbeat slightly. Other musicians involved in the Studio One rock steady sessions included Richard Ace and Robbie Lyn on keyboards; Bunny Williams, Joe Isaacs, and Fil Callendar on drums; Eric Frater and Ernest Ranglin on guitar; and the horn section of Felix "Deadly Headley" Bennett on saxophone and Vin Gordon (a.k.a. "Don D. Jr.") on trombone. Work with other producers After Studio One, Sibbles and the Heptones recorded for other producers including Lee Perry, Harry J, JoJo Hoo Kim, Niney The Observer, Clive Chin, Gussie Clarke, Lloyd Campbell, Prince Buster, Ossie Hibbert, Phil Pratt, Harry Mudie, Geoffrey Chung, Danny Holloway, Rupie Edwards, and Joe Gibbs. Other Heptones releases from the early 1970s were Book of Rules (Trojan Records) and the Harry Johnson-produced album Cool Rasta (Trojan), recorded just before the group benefited from the internationalisation of reggae via Island Records. Danny Holloway produced Night Food and Lee "Scratch" Perry-produced Party Time were the fruit of the association with Island. As