“American Idol”’s new Hollywood Week continues SUNDAY, MARCH 22 (8:00-10:00 p.m. EDT), on ABC, with the surprise of the all-new duets round. While contestants anticipate the infamous group rounds, they are in for a shock when the judges announce they have to pick just one partner to duet with on The Orpheum Theatre stage. One pair’s tensions run high as they can’t agree on a song, while sparks fly with another pair. Two pop divas come together for a powerful rendition of a Celine Dion song; and later, one pop vocalist and one country singer team up to wow the judges with their unexpected harmony.