JAY-Z released this beautiful ode to his wife and daughter on Jan. 9, 2012, two days after the latter was born. The song details the rapper's joy at becoming a father and describes the struggles he and Beyoncé went through over a previous miscarriage. Even though Blue Ivy was only two days old, her official feature credit on the track made her the youngest person to ever appear on a Billboard chart when it debuted at number 23.