The third-person, underwater exploration game Abzu (PlayStation 4, PC) was one of 2016’s more interesting and immersive games. And one element that made it so effective was the music, which really made you feel like you were scuba diving in a serene, fish-filled sea. With the score for Abzu now available on CD and digitally, I spoke to its composer, Austin Wintory, about how he came to make the music for this game and what he did to his score to make it work as an album.