Question: The band that released the song "Back to the 80's" have sold approximately how many albums and singles?

Context paragraphs:
Aqua (band): Aqua is a Danish eurodance group, best known for their 1997 breakthrough single "Barbie Girl".  The group formed in 1989 and achieved huge success around the globe in the late 1990s and early 2000s.  The group released three albums: "Aquarium" in 1997, "Aquarius" in 2000 and "Megalomania" in 2011.  The group sold an estimated 33 million albums and singles, making them the most profitable Danish band ever.

Rouge discography: The discography of Brazil girl group Rouge consists of four studio albums, one remix album, three DVDs and one "cancelled album".  The band has also released twelve official singles, two featurings and three promotional singles.  In four years of career, they achieved four Gold, three Platinum and one Diamond album in Brazil and released various hit singles, becoming the most successful Brazilian girl group of all time.  As of August 2010, the Rouge have sold approximately 6 million records.

List of best-selling albums in the United Kingdom: The best-selling album in the United Kingdom is "Greatest Hits", a compilation album by British band Queen that was first released in 1981.  s of 2016 , it has sold more than 6.12 million copies, of which approximately 124,000 have been from downloads.  Queen's second greatest hits album, "Greatest Hits II", has sold approximately 4 million copies since being released in 1991, and is the tenth biggest-selling album in the UK.  These sales figures include 50% of sales of box sets containing both these albums and 33% of sales of box sets of all three Queen "Greatest Hits" albums.

Back to the 80s (song): "Back to the 80s" is a song by Norwegian/Danish band Aqua.  The song was written by members Søren Rasted, Claus Norreen, and produced by Rasted, for their second greatest hits album (2009).  "Back to the 80s" was Aqua's first single in eight years, following the release of the 2001 single "We Belong to the Sea".

Unwind (Oleander album): Unwind is the second major label studio album from post-grunge band Oleander.  The band's second album released on Universal Records, "Unwind" sold approximately 250,000 copies.  The album is noted for displaying both a wider range and softer music than its predecessor.  It features three singles, "Are You There? ," "Champion," "Halo," as well as "Jimmy Shaker Day," a rerecording of a song from their 1997 debut, "Shrinking the Blob"

Cyndi Lauper discography: American singer Cyndi Lauper has released eleven studio albums, six compilation albums, three video albums and fifty-one singles.  Worldwide, Lauper has sold approximately 70 million albums, singles and DVDs worldwide.

Skye Sweetnam discography: The discography of Skye Sweetnam, a Canadian singer-songwriter, consists of two studio albums and five singles.  By 2007, she had sold approximately 160,000 albums worldwide and 154,000 singles digital downloads in the United States.  Her debut album spawned two hit singles in Canada and sold well in Japan, where it was Top 15 and stayed on chart for 21 weeks.

Ricardo Arjona discography: Guatemalan recording artist Ricardo Arjona has released fifteen studio albums, sixteen compilation albums, two live albums, forty-five singles and two promotional singles.  Four of his albums have reached the number-one position on the "Billboard" Top Latin Albums chart, while four of his singles have topped the "Billboard" Latin Songs chart.  Throughout his career, Arjona has sold approximately 20 million albums worldwide, making him one of the most successful Latin artists in music history.  Arjona released his debut album, "Déjame Decir Que Te Amo", in 1985.  However, his experiences while recording the album and its commercial failure led to his decision to abandon the music industry.  Despite this decision, Arjona returned and released "Jesús, Verbo No Sustantivo" in 1988.  In 1991, Arjona signed a record deal with Sony Music and released his third studio album, "Del Otro Lado del Sol".

Hanoi Rocks discography: This is a complete discography of the Finnish rock band Hanoi Rocks.  The band have released eight studio albums throughout their career and sold approximately 10 million records worldwide.

Luther Vandross discography: This is the discography documenting albums and singles released by American singer Luther Vandross.  Vandross has sold approximately 30 million records worldwide.

Supporting paragraphs: Back to the 80s (song) Aqua (band)
Answer: 33 million