Emma Watson has proved her singing credentials in Disney's live action Beauty and the Beast, and Miles Teller previously worked with La La Land director Damien Chazelle.
Even still, it's already hard to imagine anyone other than Emma Stone and Ryan Gosling starring in the much talked about Oscar-bound musical.
Writer and director Chazelle has revealed it very nearly happened, telling Uproxx: "The casting of this movie during the six years it took to get made went through lots of permutations, and it's true there was a moment where Emma Watson and Miles Teller were doing it.
"And neither of those casting things wound up lasting or working out. But it was part of the up and down of this movie: that we were about to make it, we were about to not make it, about to make it, about to not make it. But I loved working with him in Whiplash. That's why he and I started talking about doing this one together."
During an interview with Esquire back in 2015, Teller claimed Chazelle offered him the lead while they were filming the Oscar-winning Whiplash, before his agent called him up to tell him that he was "no longer creatively right for the project".
Chazelle refused to address Teller's comments, but added: "Getting a musical movie made is like a slightly bigger miracle. And it just requires every little piece.
"Like Ryan and Emma agreeing to do this and take a gamble on this and on me. It requires all these things to line up at just the right moment."
La La Land broke the records for most Golden Globe Awards at the annual ceremony over the weekend, sweeping the board with seven wins.
It claimed Best musical or comedy film, score and song, while Chazelle took home screenplay and best director. Stone and Gosling won in the acting categories.