Westlife is signed to the management of major record label Sony Music. Louis Walsh, Simon Cowell, Sonny Takhar, Tim Byrne comprise some of Westlife's management and production team.
Aside from Steve Mac and Wayne Hector, the group has the opportunities to work for their original songs with many well-known songwriters/producers including Savan Kotecha, Rami Yacoub, Per Magnusson, David Kreuger, Max Martin, Anders Johansson, Josef Larossi, Jorgen Elofsson, Andreas Carlsson, Arnthor Birgisson, Kristian Lundin, Jake Schulze, Diane Warren and most recently Ryan Tedder, Chris Braide, Sam Watters, Louis Biancaniello, and Steve Anderson.
Long-time collaborator Wayne Hector has defined the essence of Westlife songwriting:
"If you want to write a song for Westlife, you’ve got to have a lyric that connects on a basic level. We’ve always thought the reason Westlife songs have been so successful is because it’s about situations that everybody goes through. We weren’t trying to be too clever about it, we were trying to be emotional."
The group had studio recorded and live collaborations in some of the most renowned music acts such as Mariah Carey ("Against All Odds (Take a Look at Me Now)"), Lulu("Back at One"), Joanne Hindley ("The Way You Look Tonight"), Diana Ross ("When You Tell Me That You Love Me"), Donna Summer ("No More Tears (Enough Is Enough)"),Delta Goodrem ("All Out of Love"), and "If I Had Words" with The Vards. "I Have A Dream", with Indonesian childstar Sherina and "My Love" with Amr Diab. These songs were also recorded and included on the various albums. In 2002, Westlife re-recorded their hit song "Flying Without Wings" with Cristian Castro and Korean singer BoA as two separate duets.
Westlife have performed live duets with some of the biggest names in the music industry including Sinéad O'Connor ("Silent Night"), Donny Osmond ("Crazy Horses"), Mariah Carey ("Never Too Far/Hero Medley"), Secret Garden ("You Raise Me Up"), Lionel Richie ("Easy"), Ronan Keating ("The Dance"), Dolores O'Riordan of The Cranberries ("Little Drummer Boy"), Roy Orbison ("Pretty Woman"), Delta Goodrem ("All Out Of Love"), Raymond Quinn ("That's Life"), Leehom Wang ("You Raise Me Up"), Mary Black ("Walking In The Air"), Kevin Spacey ("Fly Me to the Moon"), Do ("Heaven"), JLS ("Flying Without Wings"), Boyzone ("No Matter What"), Various artists "All-Stars" ("That's What Friends Are For"; "Merry Christmas Everybody"; "I Wish It Could Be Christmas Everyday") and even their fathers ("That's Life").
Some of the music video directors who have worked with Westlife are: Cameron Casey, Wayne Isham, Nigel Dick, Stuart Gosling, Phil Griffin, Antti Jokinen, David Mould, Alex Hemming, Philip Andelman, Max Giwa and Dania Pasquini.
Shayne Ward, No Way Out, K-otic, Natural, Six, Totally Spies, D-Side and Lauren Waterworth, Bellefire, The Conway Sisters, V, Twen2y4se7en, Zoo, Kwest, Pop, No Way Out, Sub Bass 5, Traphic, Mark Dakriet, 4th Ba5e, Reel, Peter Andre, Girls Aloud, Eton Road, Gareth Gates, Roxanne, Alsou, The MacDonald Brothers, Billiam, Cushh, The Unconventionals, Dyyce, Lady Nada, Code 5, Annabel Fay, Hope, Wow, Jedward, JLS, and Wonderland have supported the boys on different tours.