"Glassheart" is a song conceptualised by Leona Lewis and a frequent collaborator who is the lead vocalist for what pop rock band?
Glassheart (song): "Glassheart" is a song recorded by British singer-songwriter Leona Lewis for her third studio album of the same name (2012). Glassheart (song):  The song was conceptualised by Lewis and frequent collaborator Ryan Tedder at his family home in Denver, Colorado. Ryan Tedder: Ryan Benjamin Tedder (born June 26, 1979) is an American singer, songwriter, musician, multi-instrumentalist, and record producer.
i don't know