This soundtrack accompanies the film Flag Day from 2021, directed by and starring Sean Penn, based on a true story. The music is largely written and performed by Eddie Vedder, singer of Pearl Jam, with contributions from Glen Hansard and Cat Power. On the album, Vedder's daughter Olivia Vedder also makes her debut with the track 'My Father's Daughter'. The mood is restrained and acoustic, with warm, melancholic folk and singer-songwriter music that carries the intimate, dramatic character of the film. It is a cohesive whole around the theme of family and loss.