Rainbow is a British rock band formed in 1975 by guitarist Ritchie Blackmore, previously of Deep Purple. Known for their heavy, guitar-driven sound, the band was significant in the development of hard rock and heavy metal music. Notable band members include Ronnie James Dio, whose powerful vocals became a signature element of the band's style, and keyboardist Don Airey. Among their influential works are the albums "Ritchie Blackmore's Rainbow" and "Long Live Rock 'n' Roll". Rainbow's blend of classical music elements with rock remains a distinguishing feature of their music.