Westlife is an Irish boy band formed in 1998, known for their harmonious vocals and heartfelt ballads. The original lineup included members Shane Filan, Mark Feehily, Kian Egan, Nicky Byrne, and Brian McFadden, who later left the group in 2004. They quickly gained popularity with hits like "Swear It Again" and "Flying Without Wings," captivating fans around the world. Over the years, Westlife has released numerous albums and sold millions of records, making them one of the best-selling music acts in history. Their music often features themes of love and friendship, appealing to a wide audience and solidifying their place in pop culture.