"Dancing Queen" is a Korean song by South Korean girl group Girls' Generation. It was released on December 21, 2012, as the lead single from their fourth Korean studio album, I Got a Boy (2013). Recorded in 2008, the song was initially scheduled to be released as the title track for the group's second studio album. Nevertheless, the plan was withdrawn, and "Gee" and the titular EP was released instead as their first extended play.

"Mercy" is a song performed by the Welsh soul singer Duffy, released as the second single from her debut studio album, Rockferry (2008). Co-written by Duffy and Steve Booker and produced by Booker, it was released worldwide in 2008 to critical acclaim and unprecedented chart success. As Duffy's first international release, the song is credited with firmly establishing her career and is now considered her signature song. "Mercy" received comparisons to Duffy's previous single, "Rockferry". Critical reviewers of "Mercy" noted similarities between the song to releases by Aretha Franklin, Dusty Springfield and the Supremes, as well as contemporaries such as fellow British singer Amy Winehouse.