Westlife is an Irish pop band that was formed on July 3, 1998. They were signed on by Simon Cowell and are currently managed by Louis Walsh. Over the years, Westlife's music has evolved from teen pop to an adult contemporary sound, with an emphasis on ballads.

The group's original lineup comprised of Nicky Byrne, Kian Egan, Mark Feehily, Shane Filan , and Bryan McFadden. Filan and Feehily are the band's lead vocalists. All of the band members are songwriters, although most of their hits have been composed by external writers. On March 9, 2004, McFadden left the band to work on solo projects (before his departure, McFadden also contributed lead vocals).

Westlife has sold more than 40 million records worldwide. They garnered 14 number one singles in the United Kingdom, the third-highest in UK history, tying with Cliff Richard and tailing behind Elvis Presley and The Beatles. The band has also won numerous awards such as the "Best Irish Pop Act" at the annual Ireland Meteor Awards and ITV "Record of the Year" award in the UK. The band has also broken a few top records, including "Music artist with most consecutive number 1's in the UK" and the "Biggest selling arena act in the UK".