Slade's seasonal classic 'Merry Xmas Everybody' has been a perennial favorite in England since its release in December of 1973. Believe it or not, after four decades, the song stands to make an estimated £800,000 in royalties this year. That's a little over $1.3 million in U.S. dollars!

In fact, 'Merry Xmas Everybody' is the top earning Christmas song when it comes to royalties when you take into account radio airplay, use on television, jukeboxes, compilation albums and record sales. Upon its initial release, the rollicking holiday stomper entered the UK charts at No. 1, but that was far from the end of the story. The record was re-released in 1980 and every Christmas season afterwards through the '90s, and again in the mid-'00s. Each and every time it was put back out, it made the charts -- most recently in 2012, when it showed up in the Top 40. That's staying power!

In a 2009 interview on the British television show, the Wright Stuff, Slade guitarist Noddy Holder, who co-wrote the song with bassist Jim Lea, explained its origin. "It took a couple or three days really. No one at that time was doing it, so we came up with a Christmas song. It was 1973, it was the middle of a recession at that time. It was a really bad time, and this was an optimistic record, (saying) 'Look to the future it's only just begun!"