Question: Domino Dancing is a song on an album that has sold over how many copies worldwide?
Context: Canadian singer Nelly Furtado has released six studio albums, twenty singles, one video album, one live album, two compilation albums, three extended plays, and twenty-three music videos.  Furtado released her debut album "Whoa, Nelly! " in 2000 and it became a commercial success selling 9 million copies worldwide.  It has been certified multi Platinum in countries such as Canada, United States, Australia and New Zealand.  The album spawned four singles including the successful top 10 hits; "I'm Like a Bird" and "Turn Off the Light".  In 2003 she released her second album "Folklore", while the album did not match the success of her previous album in such markets as the US and Australia, it did however become a success in several European countries.  "Folklore" has sold 3 million copies worldwide.  The album produced two European top 10 hits; "Powerless (Say What You Want)" and "Força", while "Try" peaked inside the top 10 in Canada.  Furtado's third album "Loose" (2006) became her best selling album of career with 12 million copies sold worldwide.  It also reached number one on the album chart of nine countries and was certified multi Platinum in several countries such as Canada, UK, Australia, Germany, Switzerland, Austria and New Zeeland.  The album spawned four successful number one singles; "Promiscuous", "Maneater", "Say It Right" and "All Good Things (Come to an End)".  "Loose" was one of the best selling albums of 2006–2007 and is twenty-second best-selling album of the 2000s.  She released her first Spanish language album "Mi Plan" in 2009 which became a success in Europe and on the Latin charts.  The lead single "Manos al Aire" became a European top 10 hit and also topped the "Billboard" Hot Latin Songs chart, making Furtado the first North American singer to reach number one on that chart with an original Spanish song.  "Mi Plan" has been certified Platinum (Latin) in the US.  In 2010 she released a remix album "Mi Plan Remixes" and her first greatest hits "The Best of Nelly Furtado".  Furtado released her fifth album "The Spirit Indestructible" in 2012, followed by "The Ride" in 2017. "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. "Lewis Takes Action" is the first single from the album "Heartland" by Canadian musician Owen Pallett.  It was released by Domino records in January 2010 in a limited edition on 7" vinyl.  It features one track from the album and one exclusive track called "A Watery Day".  The official newsletter concerning "Lewis Takes Action" called it a "super limited edition" without giving further details of how many copies were pressed.  The single was only sold through the Domino online store; however there was a chance to win a signed copy of the record by downloading the mp3 version of the track "Lewis Takes Action". The Burning Red is the third album by the American groove metal band Machine Head.  It is the band's second best selling album in the US, selling as many copies in three years as "Burn My Eyes" sold in almost eight years (1994–2002) .  The album has sold over 134,000 copies in the US and it was certified silver in 2011 by the BPI for sales of 60,000 in the UK. Evanescence is an American rock band founded in Little Rock, Arkansas in 1995 by singer/pianist Amy Lee and guitarist Ben Moody.  After recording independent albums, the band released their first full-length album, "Fallen", on Wind-up Records in 2003.  "Fallen" sold more than 17 million copies worldwide and helped the band win two Grammy Awards out of seven nominations, as well as scoring number six in CBS's "Top Bestselling Albums of the Last 10 Years" (2008).  A year later, Evanescence released their first live album, "Anywhere but Home", which sold more than one million copies worldwide.  In 2006, the band released their second studio album, "The Open Door", which sold more than five million copies. Merry Christmas is a compilation album by Bing Crosby that was released in 1945 on Decca Records.  It has remained in print through the vinyl, CD, and downloadable file eras, currently as the disc and digital album "White Christmas" on MCA Records, a part of the Universal Music Group, (reissued in June 1995) and currently on vinyl as "Merry Christmas" on Geffen Records (re-issued in September 2014).  It includes Crosby's signature song "White Christmas", the best-selling single of all time with estimated sales of over 50 million copies worldwide.  The album has sold over 15 million copies and is the second best-selling Christmas album of all-time behind "Elvis' Christmas Album", which has sold more than 19 million copies worldwide. Enrique is the debut English album and fourth studio album by Enrique Iglesias recorded in English and released in November 1999.  The album launched two No. 1 U.S Billboard hot 100 hits, Bailamos and then Be with You.  The hit single Bailamos has sold over 5 million copies worldwide.  To the date the album has sold 1.2 million copies in U.S and over 10 million copies worldwide. 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.) Canadian singer Celine Dion has released twenty-six studio albums, seven live albums, seventeen compilation albums, and twenty-one box sets.  Her debut album, "La voix du bon Dieu" was issued in 1981.  In the '80s, Dion released her French-language albums in Canada, with several compilation albums issued also in France.  Her first English-language album, entitled "Unison" was released in 1990 and has sold over three million copies worldwide.  It was followed by "Dion chante Plamondon" in 1991 and "Celine Dion" in 1992.  The latter became one of six of her albums to be certified Diamond in Canada for shipments of at least one million units.  Dion's popularity became well-established with her 1993 album, "The Colour of My Love", which topped the charts in various countries, including the United Kingdom, Canada, and Australia, and has sold twenty million copies around the world.  In the United States, it was certified six-times platinum.  Released in 1995, "D'eux" became the best-selling French-language album in history, with sales of ten million copies worldwide.  In France alone, "D'eux" spent forty-four weeks at the top of the chart and has sold 4.5 million units, becoming the best-selling album of all time.  It also became Dion's first out of six Diamond-certified albums in France. The Spice Girls were an English pop girl group formed in 1994.  The group originally consisted of Melanie Brown ("Scary Spice"), Melanie Chisholm ("Sporty Spice"), Emma Bunton ("Baby Spice"), Geri Halliwell ("Ginger Spice"), and Victoria Beckham, née Adams ("Posh Spice").  They were signed to Virgin Records and released their debut single "Wannabe" in 1996, which hit number one in 37 countries and established them as a global phenomenon.  Their debut album "Spice" sold more than 31 million copies worldwide, becoming the best-selling album by a female group in history.  Their follow-up album "Spiceworld" sold over 20 million copies worldwide.  The Spice Girls have sold 85 million records worldwide, making them the best-selling female group of all time, one of the best-selling pop groups of all time, and the biggest British pop phenomenon since Beatlemania.  Among the highest profile acts in 1990s British popular culture, "Time" called them "arguably the most recognisable face" of Cool Britannia, the mid-1990s celebration of youth culture in the UK.
Answer: 4.5 million