Artists like Westlife

A1 is a British–Norwegian boy group formed in 1998.

Michael Learns to Rock (MLTR) is a Danish soft and pop rock band formed in 1988 known for their musical popularity from early to late 2000s in Scandinavia and Asia. The band currently consists of Jascha Richter, Mikkel Lentz and Kåre Wanscher. Søren Madsen was an original member of the group since its formation but left in 2000. The band has sold over 11 million records over the course of their career, with the majority sold in Scandinavia and Asia. Despite being Danish, the band performs songs in English. The band has attributed its success in Asia to their drug-free, clean-living image, and to singing in English as a second language.

Shayne Thomas Ward is an English singer and actor. He rose to fame as the winner of the second series of The X Factor. His debut single, "That's My Goal", was released in the United Kingdom on 21 December 2005 and reached number one on the UK singles chart and was that year's Christmas number one. It sold 313,000 copies on its first day of sales, making it the third-fastest-selling single of all time in the UK, behind Elton John's "Candle in the Wind 1997" and Will Young's "Evergreen", which sold 685,000 and 400,000 copies in their first days of sale, respectively.

Gareth Paul Gates is an English singer-songwriter and actor. He was the runner-up in the first series of the ITV talent show Pop Idol in 2002. As of 2008, Gates had sold over 3.5 million records in the UK. He is also known for having a stutter, and has talked about his speech impediment publicly.

Five are an English boy band formed in 1997, consisting of members Abz Love, Scott Robinson, Ritchie Neville, Sean Conlon, and Jason "J" Brown. Five released several hit singles around the turn of the 21st century, particularly succeeding in their native United Kingdom. The group has sold over 20 million records worldwide and, according to the British Phonographic Industry (BPI), has been certified for sales of 1.6 million albums and 3.4 million singles in the UK.

Daniel John Bedingfield is a New Zealand-British singer, songwriter, record producer and actor. His debut studio album, Gotta Get thru This (2002), spawned three UK number ones, "Gotta Get thru This", "If You're Not the One" and "Never Gonna Leave Your Side", and sold 1.6 million copies in that country. His second album, Second First Impression, was released in 2004. Bedingfield was a judge on The X Factor New Zealand in 2013. He has written songs for other artists and has acted in the West End theatre in London, England.

Richard Noel Marx is an American singer-songwriter. He has sold over 30 million albums worldwide.

The Corrs are an Irish family band consisting of siblings Andrea, Sharon, Caroline and Jim. Their music combines pop rock with traditional Irish themes. They are from Dundalk in County Louth, Ireland.

William Robert Young is an English singer, songwriter and actor. He came to prominence after winning the 2002 inaugural series of the ITV talent contest Pop Idol, making him the first winner of the worldwide Idol franchise. His double A-sided debut single "Anything Is Possible" / "Evergreen" was released two weeks after the show's finale and became the fastest-selling debut single in the UK. Young also came in fifth place in World Idol performing the single "Light My Fire" written by the band the Doors.

Ni Luh Ketut Mahalini Ayu Raharja is an Indonesian singer and actress. She is known for placing fifth on the tenth season of Indonesian Idol in 2020.

A-Teens are a Swedish pop music group from Stockholm. The group was formed by Niklas Berg in 1998 as an ABBA tribute group called ABBA-Teens, which was later renamed A-Teens. The band members are Marie Serneholt, Amit Paul, Dhani Lennevald, and Sara Lumholdt. The group is best known for the singles "Mamma Mia" (1999), "Upside Down" (2000) and "Floorfiller" (2002), all of which were hits worldwide. The group has been particularly successful in their home country where they have amassed eleven top 10 hit singles on the Swedish charts.

Gary Barlow is an English singer. He is the lead vocalist of the pop group Take That.

Daniel Richard Powter is a Canadian singer-songwriter. His 2005 pop single "Bad Day" topped the Billboard Hot 100 for five weeks. He was nominated for Best Male Pop Vocal Performance at the 49th Grammy Awards for "Bad Day" and won the Juno Award for Breakthrough Artist of the Year in 2006.