Friday's Best Bets on TV

“Can You Duet” (8 p.m., CMT): So it’s not “American Idol,” but the singers in “Can You Duet” surely are just as hungry for musical dominance. The night begins with the final four duos and will end with our winners.

“ICarly” (8 p.m., Nickelodeon): The prime-time special “iCarly Saves TV” is based on the popular “iCarly” series, a show-within-a-show that tracks its characters on- and off-Webcam as they create their own Webcast — and grapple with everyday tween problems. Miranda Cosgrove stars as Carly.

“Battlestar Gallactica” (10 p.m. on Sci Fi): It’s the end of the first half of the season — the last season — of this hall-of fame drama. Producers promise important doings in a cliffhanger that will lead to the final 10 episodes, which have not yet been scheduled.