Following the controversial win of Charles Previn for One Hundred Men and a Girl in 1938, a film without a credited composer that featured pre-existing classical music, the Academy added a Best Original Score category in 1939.

Following the wins of four Walt Disney Feature Animation films in six years from 1990 to 1995 (The Little Mermaid, Beauty and the Beast, Aladdin, and The Lion King) during a period called the Disney Renaissance, it was decided to once again split the Best Original Score category by genres, this time by combining comedies and musicals together.

As Alan Bergman, the chairman of the Academy's music branch said, "People were voting for the songs, not the underscores.

This change proved unpopular in the other branches of the Academy as Charles Bernstein, chairman of the Academy's rules committee, noted that "no other Oscar category depended on a film's genre" and "the job of composing an underscore for a romantic comedy is not substantially different from working on a heavy drama.

It has never been awarded in its present form due to a prolonged drought of films meeting the sufficient eligibility requirements.

The Music Branch Executive Committee of the Academy decides whether there are enough quality submissions to justify its activation.

Music Branch members shall vote in order of their preference for not more than 15 pictures to be considered for the Score award.

Eight composers have won Oscars two years in a row: As of 2023, only 10 women have been nominated in music score categories: Ann Ronell, Tylwyth Kymry aka Meg Karlin, Angela Morley, Marilyn Bergman, Rachel Portman, Anne Dudley, Lynn Ahrens, Hildur Guðnadóttir, Germaine Franco, and Laura Karpman.

Dmitri Shostakovich and Duke Ellington were both nominated the same year but lost to the arrangers of West Side Story.

In addition, the electronic-based scores of Witness by Maurice Jarre in 1986, Rain Man by Hans Zimmer in 1989, and Her by William Butler, and Owen Pallett in 2014 have also been nominated.

Noted nominated composers known for their music mostly outside the film world include: Aaron Copland, Kurt Weill, Gian Carlo Menotti, Philip Glass, John Corigliano, Peter Maxwell Davies, Randy Newman, Richard Rodney Bennett, Stephen Schwartz, Andrew Lloyd Webber, Artie Shaw, Trent Reznor, Quincy Jones, Herbie Hancock, Jon Batiste, and Jonny Greenwood.

These popular performers were nominated in the Scoring categories: The Beatles, Prince, Pete Townshend, Rod McKuen, Isaac Hayes, Kris Kristofferson, Quincy Jones, Randy Newman, Anthony Newley, Paul Williams, Tom Waits, David Byrne, Ryuichi Sakamoto, Trent Reznor, and Matthew Wilder.