The album includes 114 music tracks not included on the original soundtrack album, primarily from Ground Zeroes and The Phantom Pain cinematic cutscenes. Music for the album is composed by Ludvig Forssell, Akihiro Honda, Rina Yugi, Moe Jono and Steve Henifin.
From the product page:
Nine years after the events of Metal Gear Solid V: Ground Zeroes and the fall of Mother Base, Snake a.k.a. Big Boss, awakens from a nine year coma. The year is 1984. The Cold War serves as the backdrop as nuclear weapons continue to shape a global crisis. Driven by revenge, Snake establishes a new private army and returns to the battlefield in pursuit of the shadow group, XOF.Apple Music - Metal Gear Solid Ⅴ Extended Soundtrack