Mariah Carey’s “All I Want For Christmas Is You” breaks the record for the longest-running No. 1 song on the Billboard Hot 100, Kelly Clarkson’s “Underneath the Tree” enters the top 10, and Nat “King” Cole, Ariana Grande and more continue to climb the chart.  Mariah Carey: It’s amazing. Honestly, it really is.  Tetris Kelly: […]