Q. Hi one that knows it all

You mentioned in one of the answers that Coldplay did some sort of colaboration with Nelly Furtado.
When i searched the internet the other day it said that the song All Good Things Come to an End is by both Nelly Furtado and Coldplay. Is this true? And if so, did Coldplay just do the instrumental parts because I never hear Chris' voice.

Thank you in advance!! :)