in Memphis. Three months earlier, on April 12, 1954, Bill Haley & His Comets recorded "Rock Around the Clock". Although only a minor hit when first released, when used in the opening sequence of the movie Blackboard Jungle a year later, it set the rock and roll boom in motion. The song became one of the biggest hits in history, and frenzied teens flocked to see Haley and the Comets perform it, causing riots in some cities. "Rock Around the Clock" was a breakthrough for both the group and for all of rock and roll music. If everything that came before laid the groundwork, "Rock Around the Clock" introduced the music to a global audience. In 1956, the arrival of rockabilly was underlined by the success of songs like "Folsom Prison Blues" by Johnny Cash, "Blue Suede Shoes" by Perkins, and the No. 1 hit "Heartbreak Hotel" by Presley. For a few years it became the most commercially successful form of rock and roll. Later rockabilly acts, particularly performing songwriters like Buddy Holly, would be a major influence on British Invasion acts and particularly on the song writing of the Beatles and through them on the nature of later rock music. Doo wop Doo-wop was one of the most popular forms of 1950s rhythm and blues, often compared with rock and roll, with an emphasis on multi-part vocal harmonies and meaningless backing lyrics (from which the genre later gained its name), which were usually supported with light instrumentation. Its origins were in African-American vocal groups of the 1930s and 40s, such as the Ink Spots and the Mills Brothers, who had enjoyed considerable commercial success with arrangements based on close harmonies. They were followed by 1940s R&B vocal acts such as the Orioles, the Ravens and the Clovers, who injected a strong element of traditional gospel and, increasingly, the energy of jump blues. By 1954, as rock and roll was beginning to emerge, a number of similar acts began to cross over from the R&B charts to mainstream success, often with added honking brass and saxophone, with the Crows, the Penguins, the El Dorados and the Turbans all scoring major hits. Despite the subsequent explosion in records from doo wop acts in the later 1950s, many failed to chart or were one-hit wonders. Exceptions included the Platters, with songs including "The Great Pretender" (1955) and the Coasters with humorous songs