| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | List of best-selling singles - 6–6.99 million copies |  |  |  |  |
| 3 | Artist | Single | Released | Sales (in millions) | Source |
| 4 | Maroon 5 | "One More Night" | 2012 | 6.9 | - |
| 5 | Usher featuring will.i.am | "OMG" | 2010 | 6.9 | - |
| 6 | Katy Perry | "California Gurls" | 2010 | 6.7 | - |
| 7 | Flo Rida | "Whistle" | 2012 | 6.6 | - |
| 8 | Train | "Hey, Soul Sister" | 2009 | 6.6 | - |
| 9 | Rihanna featuring Jay Z | "Umbrella" | 2007 | 6.6 | - |
| 10 | Taylor Swift | "Love Story" | 2009 | 6.5 | - |
| 11 | Flo Rida featuring Sia | "Wild Ones" | 2012 | 6.5 | - |
| 12 | Bruno Mars | "The Lazy Song" | 2011 | 6.5 | - |
| 13 | Shōnan no Kaze | "Junrenka" | 2006 | 6.5 | - |
| 14 | Justin Bieber featuring Ludacris | "Baby" | 2010 | 6.4 | - |
| 15 | Timbaland | "Apologize" | 2008 | 6.2 | - |
| 16 | Paramore | "crushcrushcrush" | 2007 | 6.1 | - |
| 17 | Beyoncé | "Single Ladies (Put a Ring on It)" | 2008 | 6.1 | - |
| 18 | A Great Big World and Christina Aguilera | "Say Something" | 2013 | 6 | - |
| 19 | Clean Bandit featuring Jess Glynne | "Rather Be" | 2014 | 6 | - |
| 20 | Kimura Kaela | "Butterfly" | 2009 | 6 | - |
| 21 | The Pussycat Dolls featuring Busta Rhymes | "Don't Cha" | 2005 | 6 | - |

Question: Which best selling singles sold 6.6 million copies?
Answer: Umbrella, Whistle, and Hey, Soul Sister have each sold 6.6 million copies, making them some of the best selling singles.