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You can play along with the video in GCEA tuning to learn the song, if you put your capo on the 5th fret!
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. "Mercy" peaked at number one on the UK Singles Chart in February 2008, remaining at the top of the chart for five weeks. (Wikipedia)