Adam Levine departed after season 16, but his best frenemy, Blake Shelton, still remembers their time together!During the final night of the season 20 Blind Auditions on Monday, singer and pianist Keegan Ferrell impresses the coaches with his performance of a beloved Maroon 5 track, «She Will Be Loved.» Only Blake and Kelly Clarkson have open spots left on their teams, and when both turn their chairs, Blake pulls out the big guns to win Keegan over!«I happen to be buddies with the guy that wrote