Crazy Train was released in 1980 as Ozzy Osbourne's first solo single, taken from his debut album Blizzard of Ozz. The track was co-written with guitarist Randy Rhoads, whose opening riff became one of the most recognisable in heavy metal. The song became a staple of rock radio, sports arenas and live shows, and its intro has since been widely reused online in edits, memes and short clips where an instant burst of classic metal energy is needed.