They have collaberated with Mariah Carey , Delta Goodrem, This swiss guy I forgot the name of , Boyzone , U2 (live performance) , JLS (Live performance on the X Factor) , Ray Quinn (Live performance) etc. Which do I like best? NONE. WESTLIFE are too amazing and too huge to sing with others, they are good on their own and I don't like any of their collebarations , its different for a band to colleberate, there's so many of them already!
WESTLIFE are beautiful singers with beautiful vocals and they are better when they sing alone , other people that do duets with them just ruin the song in my opinion. Westlife rule , thats right. They rule this WORLD (and my heart) .