[TOMT] [Artist] Singer that sounds like the main vocals in 'Something just like this'

Hello, so everytime I listen to The Chainsmoker's song 'Something just like this' I have a really strong feeling that the vocalist sounds like someone else, and it is driving me nuts. I cannot listen to the song as whenever I do I can't pinpoint this resemblance. I can almost see the singer I perceive it to be on a stage but it just fuzzes out. I was just wondering if anyone else had made this connection and could let me know who it is? Thank you