Reggae is a music genre first developed in Jamaica in the late 1960s. While sometimes used in a broader sense to refer to most types of Jamaican music, the term reggae more properly denotes a particular music style that originated following on the development of ska and rocksteady. Reggae is based on a rhythmic style characterized by accents on the off-beat, known as the skank. Reggae is normally slower than both ska and rocksteady. Reggae usually accents the second and fourth beat in each bar, with the rhythm guitar also either emphasising the third beat or holding the chord on the second beat until the fourth is played. It is mainly this "third beat", its speed and the use of complex bass lines that differentiated reggae from rocksteady, although later styles incorporated these innovations separately. Reggae developed from rocksteady music in the 1960s. The shift from rocksteady to reggae was illustrated by the organ shuffle, which was pioneered by Bunny Lee and was featured in the transitional singles "Say What You're Saying" (1967) by Clancy Eccles, and "People Funny Boy" (1968) by Lee "Scratch" Perry. The Pioneers' 1967 track "Long Shot Bus' Me Bet" has been identified as the earliest recorded example of the new rhythm sound that became known as reggae. Early 1968 was when the first genuine reggae records were released: "Nanny Goat" by Larry Marshall and "No More Heartaches" by The Beltones. American artist Johnny Nash's 1968 hit "Hold Me Tight" has been credited with first putting reggae in the American listener charts. Around that time, reggae influences were starting to surface in rock music. An example of a rock song featuring reggae rhythm is 1968's "Ob-La-Di , Ob-La-Da." by The Beatles. Notable Jamaican producers who were influential in the development of ska into rocksteady and reggae include: Coxsone Dodd, Lee "Scratch" Perry, Leslie Kong, Duke Reid, Joe Gibbs and King Tubby. Chris Blackwell, who founded Island Records in Jamaica in 1960, relocated to England in 1962, where he continued to promote Jamaican music. He formed a partnership with Trojan Records, founded by Lee Gopthal in 1968. Trojan released recordings by reggae artists in the UK until 1974, when Saga bought the label. The 1972 film The Harder They Come, starring Jimmy Cliff, generated considerable interest and popularity for reggae in the United States, and Eric Clapton's 1974 cover of the Bob Marley song "I Shot the Sheriff" helped bring reggae into the mainstream. By the mid 1970s, reggae was getting radio play in the UK on John Peel's radio show, and Peel continued to play reggae on his show throughout his career. What is called the "Golden Age of Reggae" corresponds roughly to the heyday of roots reggae.