The Musical Impression Generator first challenged Keys to sing "Miss Mary Mack" as fellow Voice coach Gwen Stefani. The singer, bouncing around with some Stefani-styled hand gestures, followed the rapped-sung style of 2004 hit "Hollback Girl."
Fallon countered with two jingles: The Pointer Sisters singing the State Farm jingle and Elvis Presley singing the Meow Mix theme. But Keys stole the segment with her impersonations of Adele belting "The Alphabet Song" and a smoky Janis Joplin on 'Twinkle, Twinkle Little Star."
The Voice Season 12 features the coach line-up of Keys, Adam Levine, Blake Shelton and the returning Stefani. Part three of the "Blind Auditions" episode airs Thursday, March 2nd on NBC.
Singer-songwriter and 'Voice' coach talks about the lessons Prince taught her.