C-Martin & J- HOVA

I don't know how this stuff happens. Are they just in the ultrabackstage at Glastonbury and J is like, "Yo C. Let me lace one of your tracks!" and Chris Martin is all like, "Why thank you Jay, Old Chap. I must say that would be most delightful." Or do managers call one another and have talks about reaching new demographics? I really hope that it's the first scenario (but I doubt it).