Vai began his rise to public acclaim in 1983 when, shortly before the release of "Flex-Able", his composition "The Attitude Song" was published in "Guitar Player" magazine. The song centered itself on a main guitar riff in the time signature 7/16, played over a rhythm section centered in 4/4. Each following section of the song showcased a number of specialized techniques (such as two-handed tapping, whammy bar acrobatics, sweep picking, alternate picking, multi-part harmonies, and odd phrasing) used in angular and exaggerated ways that were unique to the song at the time. Interest from the public eye grew more so when Vai's song "Blue Powder" (a demonstration for the Carvin X100b amplifier) was published in "Guitar Player" as well, which showed the virtuoso side of Vai's compositional process. Also in 1986, Vai was cast in the blockbuster film "Crossroads" as the Devil's guitar player "Jack Butler". In the famous "duel scene" between Vai and Ralph Macchio's character, Vai wrote and performed all guitar parts with the exception of the slide guitar, which was performed by Ry Cooder.