Question: "Glassheart" is a song conceptualised by Leona Lewis and a frequent collaborator who is the lead vocalist for what pop rock band?
Sentence (from "Burn (Ellie Goulding song)"): The song was written by Ryan Tedder, Goulding, Greg Kurstin, Noel Zancanella and Brent Kutzle, while production was handled by Kurstin and vocal production was done by Tedder.
Relevant evidence: No