"Blue Magic" is the first single from Jay-Z's tenth studio album, American Gangster. The song was released as a single on September 20, 2007. In the chorus, Pharrell sings an interpretation of the song "Hold On" by the R&B girl group En Vogue, who are also featured in the song. The name "Blue Magic" is a reference to a potent form of heroin sold by Frank Lucas at the height of his drug trade in Harlem, New York. An official remix features Pharrell and Trey Songz. Blue Magic also samples the 1931 horror film, Frankenstein.