What started out as an idea to raise money for charity has blossomed into a huge campaign backed by the likes of Sharon Osbourne, Philip Schofield and...our very own Christine Talbot.
A group called The Cancer Fighters, from Lincolnshire, have released their version of a 1970s pop classic to raise awareness of the condition and boost funds for Cancer Research UK.
But they had to get permission from the song's witers to adapt the lyrics. They got that - and just a little bit more, as Mark Witty explains:
Click below to watch more of The Cancer Fighters' version of the song: