"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.
i don't know