In the intimate concert, streaming from Hulu, the pop superstar sings a string of her hits from "Rolling in the Deep" to "Someone Like You" to "Chasing Pavements." By Erin Carlson 54th Grammy Awards ...

(In 2018, the Billboard staff released a list project of its choices for the Greatest Pop Star of every year, going back to 1981. Read our entry below on why Adele was our Greates ...