Here is a good article about Goodboys from the UK http://www.crossrhythms.co.uk/articles/music/Goodboys__The_Hillsong_Church_UK_trio_with_the_Piece_Of_Your_Heart_mega_hit/66579/p1/
Here is a quote:
All three members of Goodboys worship at Hillsong Church, London and on the church website they explained how they sent demos of some songs to Meduza and, six months later, were told that the production team were flying over to London from Italy.
As Josh explained, "They said, 'Hey, we should hook up and write some songs together.' It was super random, but that's how it all began.
Thanks :). God Bless :).