The stunning ballad scored Rihanna her first Oscar nomination alongside Tems, Ryan Coogler and Ludwig Göransson.
Bertelmann's win marks the fourth for 'All Quiet' at this year's ceremonies, and the second straight win for German composers in the best score category.
Gaga began her performance of the "deeply personal" song with just a piano for accompaniment.
The preview of the live-action rendition of 'The Little Mermaid' premiered Sunday night.
Byrne and Hsu performed the 'Everything Everywhere All at Once' nominee in all white.
This is his third time hosting.
The 95th annual Academy Awards are hosted by Jimmy Kimmel.
The 95th annual Academy Awards took place on Sunday, March 12.
For the first time in three years, all five nominated songs will be performed on the telecast.
Michael Buble, Tenille Townes, Kaytranada and Anderson .Paak were also among the winners.
