United States. To meet the demand for that music, entrepreneurs such as Prince Buster, Coxsone Dodd, and Duke Reid formed sound systems. As the supply of previously unheard tunes in the jump blues and more traditional R&B genres began to dry up in the late 1950s, Jamaican producers began recording their own version of the genres with local artists. These recordings were initially made to be played on "soft wax" (a lacquer on metal disc acetate later to become known as a "dub plate"), but as demand for them grew eventually sometime in the second half of 1959 (believed by most to be in the last quarter) producers such as Coxsone Dodd and Duke Reid began to issue these recording on 45rpm 7-inch discs. At this point, the style was a direct copy of the American "shuffle blues" style, but within two or three years it had morphed into the more familiar ska style with the off-beat guitar chop that could be heard in some of the more uptempo late-1950s American rhythm and blues recordings such as Domino's "Be My Guest" and Barbie Gaye's "My Boy Lollypop", both of which were popular on Jamaican sound systems of the late 1950s. Domino's rhythm, accentuating the offbeat, was a particular influence. This "classic" ska style was of bars made up of four triplets but was characterized by a guitar chop on the off beat—known as an upstroke or 'skank'—with horns taking the lead and often following the off-beat skank and piano emphasizing the bass line and, again, playing the skank. Drums kept time and the bass drum was accented on the third beat of each four-triplet phrase. The snare would play side stick and accent the third beat of each 4-triplet phrase. The upstroke sound can also be found in other Caribbean forms of music, such as mento and calypso. Ernest Ranglin asserted that the difference between R&B and ska beats is that the former goes "chink-ka" and the latter goes "ka-chink". Famous ska band the Skatalites recorded "Dynamite", "Ringo" and "Guns of Navarone". One theory about the origin of ska is that Prince Buster created it during the inaugural recording session for his new record label Wild Bells. The session was financed by Duke Reid, who was supposed to get half of the songs to release. The guitar began emphasizing the second and fourth beats in the bar, giving rise to