From YouTube creators and married musicians Sam Tsui and Casey Breves comes an adventure around the world to celebrate the role of music throughout cultures after one girl asks, Why do we sing?Lullabies, love songs, caroling, karaoke—have you ever wondered . . . why do we sing?Travel the world and learn about the reasons we sing—to have fun and share our stories; to pass the time and remember times past; and to come togeth...