Number Ones in 2011

Train's guitaris Jimmy Stafford was forced to learn how to play ukulele (on Google) before lead singer Pat Monahan was happy with the sound of 'Hey, Soul Sister.'

Number one from Apr 26, 2010 to Jan 9, 2011 | Apr 19, 2010 to Apr 25, 2010 | May 10, 2010 to May 16, 2010 | Apr 12, 2010 to Apr 18, 2010 | May 3, 2010 to May 9, 2010

Grenade reached number 1 on the chart in over 10 countries and has sold more than 10.2 million copies, making it one of the most sold singles of all time.

Number one from Jan 17, 2011 to Jan 30, 2011 | Jan 10, 2011 to Jan 16, 2011

Wynter Gordon admitted that the song is a lyrical product of her and her girlfriends goofing around in the studio

Number one from Jan 31, 2011 to Feb 6, 2011 | Feb 21, 2011 to Feb 27, 2011 | Feb 7, 2011 to Feb 20, 2011

S&M actually samples the synthesizer line from Depeche Mode's 1984 hit Master and Servant

Number one from Mar 21, 2011 to Mar 6, 2011 | Mar 28, 2011 to Apr 3, 2011 | Mar 7, 2011 to Mar 13, 2011

Lady Gaga has explained that the song is inspired by 1990s music that empowered women and the gay community, she also added Born This Way was her freedom song

Number one from Apr 11, 2011 to Apr 17, 2011 | Mar 14, 2011 to Mar 20, 2011 | Apr 4, 2011 to Apr 10, 2011

The song went to number 1 in over 5 countries and is Jessie J's biggest selling single to date.

Number one from Apr 25, 2011 to May 1, 2011

The song's release coincided with Lopez's appointment as a judge on the tenth season of US reality TV show American Idol, as well as several other product endorsement deals, how convenient!

Number one from Apr 18, 2011 to Apr 24, 2011

The song became the fastest song in digital history to reach 6 million sales mark, overtaking Adele's Rolling in the Deep

Number one from May 16, 2011 to May 29, 2011 | Jun 20, 2011 to Jun 26, 2011 | May 9, 2011 to May 15, 2011 | May 30, 2011 to Jun 5, 2011

Number one from Jun 13, 2011 to Jun 19, 2011 | Jun 27, 2011 to Jul 3, 2011 | Jul 11, 2011 to Jul 17, 2011 | Jul 4, 2011 to Jul 10, 2011 | Jun 6, 2011 to Jun 12, 2011

David Guetta's remix features Jomanda's "Don't You Want My Love" in the same style as Felix's "Don't You Want Me", and has proved to be more successful than Jomanda's original version

Number one from May 2, 2011 to May 8, 2011

Katy admitted that she was inspired to write the track after a night of wild partying and streaking

Number one from Aug 1, 2011 to Aug 7, 2011 | Jul 18, 2011 to Jul 31, 2011

So far the song has been featured in the TV series 90210, Gossip Girl and Glee. In February 2012, Gotye made his American television debut on Jimmy Kimmel Live! where he performed the song

Number one from Oct 17, 2011 to Oct 23, 2011 | Sep 5, 2011 to Sep 11, 2011 | Oct 31, 2011 to Nov 6, 2011

The lyrics of the song refer to a male's ability to impress a female with his dance moves, the sexy moves are compared to those of Mick Jagger, frontman of the English band The Rolling Stones.

Number one from Aug 22, 2011 to Aug 28, 2011 | Oct 3, 2011 to Oct 9, 2011 | Aug 29, 2011 to Sep 4, 2011 | Nov 14, 2011 to Nov 20, 2011 | Sep 12, 2011 to Sep 18, 2011 | Oct 10, 2011 to Oct 16, 2011 | Sep 19, 2011 to Sep 25, 2011 | Aug 15, 2011 to Aug 21, 2011 | Sep 26, 2011 to Oct 2, 2011

The hilarious video that accompanies the track features a 'Wiggle Off' and plenty of scary Speedo action

Number one from Jan 16, 2012 to Jan 22, 2012 | Jan 9, 2012 to Jan 15, 2012 | Dec 19, 2011 to Dec 25, 2011 | Jan 2, 2012 to Jan 8, 2012 | Dec 12, 2011 to Dec 18, 2011 | Dec 26, 2011 to Jan 1, 2012 | Jan 23, 2012 to Jan 29, 2012

Kelly has described the song as a "vocally raw record" and stated that she and her producers strove to record her voice as it is heard at live performances

Number one from Oct 24, 2011 to Oct 30, 2011

Many people believe the song refers to Rihanna's ex-boyfriend Chris Brown who assaulted her 2 years prior to the release of the song

Number one from Nov 21, 2011 to Nov 27, 2011 | Dec 5, 2011 to Dec 11, 2011 | Nov 28, 2011 to Dec 4, 2011

The song features Adam Levine, lead singer of band Maroon 5, who sings the hook

Number one from Nov 7, 2011 to Nov 13, 2011