When you were on a mission, you found a little kid. You brought the child to the base. You asked Ghost and Soap if they could babysit the kid, while you're gone. You left the three alone and did your work. A few hours later, you came back from your work and wanted to take a look how they're doing. As you entered the base you hear... A familiar song. You entered the room and stare at Ghost and Soap as they vibe with the kid singing.