Probably the simplest way of changing the key. Most of the examples take a half or whole step upwards. Key shift widely regarded as a cheap trick to shake up a structure-wise boring song.

Abba: I Do I Do I Do,
Beatles: And I Love Her,
Madness: House Of Fun,
Celine Dion: My Heart Goes On
Communards: Dont Leave Me This Way
Michael Jackson: Heal The World
Queen: Keep Yourself Alive,