Lakeshore Records will release the Regression – Original Motion Picture Soundtrack digitally on October 23, 2015 and on CD October 30. The album features original music by Roque Banos.

"Alejandro Amenabar is a composer as well as director, but he wanted to leave on me all the creative aspects on this score," Banos explained. "When I saw the movie for the first time, it was without any reference or temp music, so I literally had to start from zero. We did have a conversation about the mood of course, but these were general aspects in tones such as mysterious, magic, horror, ancestral vocals, etc."

"When I compose, I generally start from the very beginning and continue chronologically, but in this case I started from the last scene of the movie and went backwards," explained Banos. "One of the main themes, the 'Regression theme,' is a twelve-tone melody. This is a very rare, never used in film, way of composing. This gives it a very mysterious and dizzy feeling to when we go inside of a mind in the regression scenes. I also used it backwards—Alejandro and I thought this worked really week in the story."

Regression will be released in theaters early next year.