With her iconic whistle register, decades of hits and co-opt of all things Christmas, it's a wonder why Mariah Carey hasn't been given this honor sooner. At Monday's iHeartRadio Music Awards ...

Click the button below to learn about some of our earliest Christmas number ones. Sir Cliff Richard has managed to top the charts in five decades, with number one singles from the 1950s to the 1990s.

whether it's animation, drama, musicals or even outright comedies. There are certain elements which have appeared in many movies which went on to be huge hits at the Christmas blockbuster.