Randy Newman was announced as the composer for TOY STORY 4 at the presentation for the film at the D23 Expo in August 2015, Lasseter introduced Randy onstage to perform "You've Got A Friend In Me" and said he's returning for the new film.
Jim Morris, the President of Pixar Animation Studios, also confirmed the news during an interview on Australian television in September 2015, saying Randy will be writing a new song and scoring the film.