Ragga refers to reggae in which the backing instrumentation (or the vast majority of it) is digital. The style is most commonly associated with dancehall, and while not all dancehall reggae is electronic (and therefore not ragga), there is a great deal of overlap between the two. "Ragga" is short for "raggamuffin," originally a term for a Kingston ghetto youth; the music took on that name as it became the younger generation's style of choice in the mid- to late '80s. Because of the relatively low costs of building synthesized rhythms, ragga became the preferred mode for many Jamaican producers as well, enabling them to turn out thousands of singles per year, and to craft more adventurous new rhythms instead of simply borrowing them from old rock steady records. This also led to the explosion of the "rhythm album," for which different artists would record their own lyrics and melodies over the same pre-existing rhythm track. Although ragga is linked in the minds of many with deejay toasting, straight-ahead singers often address romantic and Rastafarian concerns, and the two vocal styles are frequently mixed as well. The first ragga record was Wayne Smith's 1985 single "Under Me Sleng Teng," which was produced by King Jammy and built around a rhythm that was discovered pre-programmed on a Casio keyboard. Its impact was immediate, spawning a host of imitators and establishing Jammy for a time as Jamaica's most dominant producer. During the '90s, ragga remained firmly entrenched as the most popular sound in Jamaican dancehalls. It began to incorporate hip-hop sampling techniques, and several of its artists scored pop crossover hits in the U.S.; ragga was also an important influence on the U.K.'s thriving jungle/drum'n'bass scene.