The singer collaborated with the French music producer on her new track "Killah," which he performed with her during Friday's closing set.

Lady Gaga's stunning theatrical Coachella set was an operatic triumph, writes SFGATE tech reporter Stephen Council.

Over the span of two hours, Lady Gaga jumped across her expansive discography. Her opening medley, which consisted of “Bloody Mary,” “Born This Way,” “Abracadabra,” “Judas,” and “Poker Face,” stayed true to Gaga’s current Mayhem visual ethos.