LOS ANGELES, CA - JANUARY 27: Recording artists Alicia Keys (L) and John Legend perform onstage during "The Night That Changed America: A GRAMMY Salute To The Beatles" at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for NARAS)

In this Carpool Karaoke Series extended preview, James Corden challenges Alicia Keys and John Legend to put their masterful voices to the test by having them create instant jingles for unusual items.