Westlife were an Irish boy band, formed in July 1998 and disbanded in June 2012. Originally signed by Simon Cowell and managed by Louis Walsh, the group's final line-up consisted of Nicky Byrne, Kian Egan, Mark Feehily and Shane Filan. Brian McFadden was a member from 1998 until his departure in 2004. Filan and Feehily act as the lead singers of the band.

Westlife sold over 45 million records worldwide, a total that included studio albums, singles, video releases, and compilation albums. The group accumulated 14 number-one singles in the United Kingdom. They achieved a total of 26 UK top ten singles over their 14-year career. Westlife are the most frequent winner of The Record of the Year, winning four times, and in 2012, the Official Charts Company listed Westlife 34th amongst the biggest-selling singles artists in British music history. Despite their success worldwide, Westlife never managed to break into the U.S. market, achieving only one hit single in 2000: "Swear It Again".