Apple is delaying its own original-series version of “Carpool Karaoke." The iPhone-maker told Reuters its debut has been postponed to an unknown date “later this year.” The show was supposed to debut on Apple Music in April. The cause of the delay is unclear. "Karaoke,” will feature a unique pairing of celebrities in each episode, such as John Legend with Alicia Keys and Billy Eichner with Metallica.