We did a bit of a double take when Frankie tweeted that his band The Telescreen had recently been in touch with Bronson at his maximum-security prison, and Bronson had sent them hand-written lyrics for the song.
Bronson, 62, has been dubbed the "most violent prisoner in Britain" and is currently serving a life sentence on charges including robbery and kidnap.
So, how did this bizarre collaboration come about?!
Frankie told The Sun: "I was watching an interview with Tom Hardy from when he played Charlie in the film Bronson. He was talking about advice Charlie had given him on his broken heart.
"At the time, me and my guitarist Dom could relate. We decided to write him a letter asking for his wise words and told him about the band. We asked him for a drawing for the front cover and he went one better and wrote lyrics to put the music to."
Frankie later shared a photo of himself holding the lyrics to Twitter, although he's yet to reveal the final song.
The 22-year-old found fame on The X Factor back in 2011 but was dramatically axed from the talent contest after breaking show rules.
He said at the time: "My life during the show has gone out of control and my behaviour off stage has overstepped the rules of the competition. I no longer deserve my place in the show, so I am therefore leaving. I would like to thank everyone who has supported me."
Frankie went on to appear on Celebrity Big Brother before launching new band The Telescreen.
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