Metallica Sing Rihanna’s ‘Diamonds’ in ‘Carpool Karaoke’ TrailerMetallica Sing Rihanna’s ‘Diamonds’ in ‘Carpool Karaoke’ TrailerMetallica show off their pop side singing Rihanna's 'Diamonds' in the latest trailer for 'Carpool Karaoke.'Joe DiVitaJoe DiVita