Here are some artist that i never get bored to listen to their songs:
Maroon 5
ColdPlay
Owl City
Taylor Swift
Westlife
I meant it when said i never get bored for them. I could play them all day long. Maroon 5 songs are amazing.
Coldplay songs sound magical.
Owl City songs are spiritfull.
Taylor Swift's had the beat and had the girl power vibes.
Westlife's songs are easy to listen and to sang along and also nostalgic.

Sometimes, I also like to listen to:
No Doubt
Spice Girl
Selena Gomez
One Direction
Mariah Carey