The Oscars paid tribute to those in the entertainment industry who died in the past year during the "In Memoriam" segment.

Michael Gambon, Chita Rivera, Alan Arkin, Julian Sands, Andre Braugher, Glynis Johns, Paul Reubens and Ryan O'Neal were among the stars who were remembered, as well as Mathew Perry, Richard Lewis, Lee Sun-Kyun and Carl Weathers.

During the segment, Andrea Bocelli sang "Time to Say Goodbye" with his son Matteo Bocelli.

“Oppenheimer” won the Oscar for best original score.

Ariana Grande and Cynthia Erivo presented the award to composer Ludwig Göransson. This is his second Oscar win and third nomination.

Upon accepting the award, Göransson thanked director Christopher Nolan for allowing him to collaborate with his wife, acclaimed violinist Serena McKinney.

Other nominees in the category included “American Fiction,” “Indiana Jones and the Dial of Destiny,” “Killers of the Flower Moon,” and “Poor Things.”

Billie Eilish and Finneas O'Connell won the Oscar for best original song.

The sister and brother duo's hit song, "What Was I Made For?" from "Barbie," marked the duo's second Oscar win for best original song. They previously won the award in 2022 for their song "No Time To Die" from the James Bond film of the same name.

During their acceptance speech, Eilish said she felt "so incredibly lucky" and "honored" to take home the award.

"Thank you for this," she said. "I'm so grateful for this song and for this movie and the way that it made me feel, and -- this goes out to everyone who was affected by the movie and how incredible it is."

Other nominees in the category included "The Fire Inside" by Diane Warren from "Flamin' Hot," "I'm Just Ken" by Mark Ronson and Andrew Wyatt from "Barbie," "It Never Went Away" by Jon Batiste from "American Symphony" and "Wahzhazhe (A Song For My People)" by Scott George from "Killers of the Flower Moon."

Ryan Gosling and Mark Ronson took the Oscars stage and delivered an epic performance of "I'm Just Ken" from "Barbie."

During his performance, Gosling was joined by his fellow Kens from the film and got director Greta Gerwig and co-stars Margot Robbie and America Ferrera to join a sing-along from the audience.

The performance also featured Guns N' Roses guitarist Slash, who played on the recorded track.

"I'm Just Ken," which was written and co-produced by Ronson and Andrew Wyatt, is nominated for best original song tonight.

Jimmy Kimmel is hosting tonight, marking his fourth time helming the awards show.

Ahead of the show, Kimmel opened up to "Good Morning America" about why he decided to return as host.

"There were some really good movies," he said in an interview that aired March 7. "I think they're all really good. I saw them all."

"It's a big part of why I decided to host the show this year, because I do know that there are movies that people have actually seen, which makes it a lot easier to make jokes about."

The talk show host's wife, screenwriter Molly McNearney, also returns as one of the ceremony's executive producers for the second consecutive year.

Kimmel previously hosted the 89th Academy Awards in 2017, the 90th Academy Awards in 2018 and the 95th Academy Awards in 2023.