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 "Ryan Tedder"): As well as being the lead vocalist for the pop rock band OneRepublic, he has an independent career as a songwriter and producer for various artists, including Madonna, U2, Adele, Beyoncé, Maroon 5, Demi Lovato, Ariana Grande, Kelly Clarkson, Jennifer Lopez, Westlife, Ed Sheeran, One Direction, Big Time Rush, Camila Cabello, Taylor Swift, Leona Lewis, Zedd and MØ.
Relevant evidence: Yes