Until they came back together to sing the Wicked‘s part one closer, "Defying Gravity." While Ariana watched in amazement, seeing Erivo soar, nailing those final notes, as did the audience. The performance earned a standing ovation.

Grande first delivered a moonlit rendition of “Over the Rainbow,” which Judy Garland famously sang as Dorothy in the movie “The Wizard of Oz.” Erivo then belted her version of “Home” from the 1975 Broadway musical “The Wiz,” a Dorothy number originally performed by Stephanie Mills onstage and by Diana Ross in the 1978 film adaptation.

This year's Oscars didn't have traditional best song performances, but the show brought a wallop of music anyway. Here's how it turned out.

If you missed some or all of the 3½-hour show, here is the good, the bad and the sometimes ugly of Hollywood’s biggest night.Start the day smarter. Get all the news you need in your inbox each morning.

Stars Ariana Grande and Cynthia Erivo teamed up for a medley of Oz songs. Grande kicked things off singing “Over the Rainbow” from “The Wizard of Oz” followed by a rendition of “Home” from “The Wiz” by Erivo.