[PAR] [TLE] Introspective [SEP] Introspective is the third studio album by English synthpop duo Pet Shop Boys.  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.  (Their fifth studio album, "Very", sold more than 5 million copies worldwide.) [PAR] [TLE] Domino Dancing [SEP] "Domino Dancing" is a song recorded by the British synthpop duo Pet Shop Boys, released as the lead single from their 1988 album, "Introspective".  It reached number 7 on the UK Singles Chart.
[PAR] [TLE] Introspective [ SEP ] Introspective is the third studio album by English synthpop duo Pet Shop Boys . 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 . ( Their fifth studio album , " Very " , sold more than 5 million copies worldwide . ) [PAR] [TLE] Domino Dancing [ SEP ] " Domino Dancing " is a song recorded by the British synthpop duo Pet Shop Boys , released as the lead single from their 1988 album , " Introspective " . It reached number 7 on the UK Singles Chart .
Domino Dancing is a song on an album that has sold over how many copies worldwide?
Domino Dancing is a song on an album that has sold over how many copies worldwide ?
4.5 million
4.5 million