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Mariah Carey, March 2015
Carey was the guinea pig of the new segment, and tried to deny that she would participate, but couldn't resist in the end.
Best Karaoke Song: "Thirsty"
Justin Bieber, May 2015
A lot of good stuff here: the dance moves, the Rubix cube, the clothing swap, and the eating of the fries.
Best Karaoke Song: "Baby" aka "The song with the most dislikes on the Internet." - Bieber.
Iggy Azalea, June 2015
The part about Corden's "physique" and skills in the bedroom was pretty awkward, but overall this might be the best Iggy interview ever.
Best Karaoke Song: "Black Widow"
Rod Stewart & A$AP Rocky, July 2015
One of the most under-rated Carpool performances. Stewart is a damn treat, and then cameo with A$AP Rocky was brilliantly random. Stewart has truly maintained his whole rock-n-roll ego.
Best Karaoke Song: "Everyday"