Domino Dancing is a song on an album that has sold over how many copies worldwide?
Domino Dancing: "Domino Dancing" is a song recorded by the British synthpop duo Pet Shop Boys, released as the lead single from their 1988 album, "Introspective". Introspective:  It was first released on 11 October 1988 and is the Pet Shop Boys' second-best-selling album, selling over 4.5 million copies worldwide.
4.5 million