I thought Emily's version sounded vaguely familiar. Jacquie Lee, originally on the Voice US and signed to Atlantic Records put a GJWTHF cover on her EP and sang it at an MTV concert.

http://youtu.be/iKIuoYcw8pI

just about all the versions you get on XF are rip offs of versions on youtube with louis's inevitable "you made that your own" when the judges comment

Emily Middlemas ripped this version off from Taylor Henderson as he had a Folk vibe to himself.

https://youtu.be/zj35xzZhK0Y