To celebrate the release of their first ever holiday single, “A Carefree Christmas,” Hoda Kotb and Jenna Bush Hager pair up with TODAY fans Alison Ryser from Iowa and Kayla Kastner from Louisiana to ...

The lyrics of more than 6,000 songs were analyzed. This is an Inside Science story. "Clap along if you feel like happiness is the truth," sings Pharrell Williams in "Happy," but the joyful sentiments ...