Byrne wuxuu ku biiray Westlife oo ay weheliyaan Kian Egan, Mark Feehily, Shane Filan iyo Brian McFadden. Byrne wuxuu shaaca ka qaaday Westlife: Sheekadeena in uu doonayay inuu magaca kooxda u beddelo West High; laakiin kuwa kale waxay doorbidaan Westlife. Iyada oo Westlife, Byrne wuxuu lahaa 25 tobanka ugu sareeya UK, 14 ka mid ah, waxay ahaayeen lambar 1, 7 lambar 1 albums oo ay ka iibiyeen in ka badan 55 milyan oo rikoor oo adduunka oo dhan ah. Waxaa la xaqiijiyay in Westlife ay iibiyeen 20.2 milyan oo rikoor iyo fiidiyowyo UK oo dhan 14-kii sano ee ay shaqeynayeen <unk> 6.8 milyan oo keli ah, 11.9 milyan oo rikoor iyo 1.5 milyan oo fiidiyow. Byrne sidoo kale wuxuu lahaa hal lambar oo Ireland ah 2002, oo ay weheliyaan kooxda kubada cagta ee Jamhuuriyadda Ireland iyo kooxda qaranka ee FIFA 2002 ee Turkiga.
Kian Egan, Mark Feehily, Shane Filan iyo Brian McFadden