The way Suzuki composed for the game was to get many gameplay videos. Some themes featured on Final Fantasy XV: Original Soundtrack aim to encompass 'friendship' and 'filial bonds.' Shimomura tried many different methods, discussed with directors to share the world view, looked at images for inspiration, and read and took in the story to be inspired. Nakama started working on the game in 2014, and worked on the trailers. At the same time, he was also composing for the movie, Kingsglaive: Final Fantasy XV. In total, he did around twenty-five pieces. Suzuki worked on the game for one year, on and off, and did have a crunch time. This is the first time a Final Fantasy game uses a North American orchestra. Every line ensemble was through VGO, and Shota's team mixed it as well. VGO was contracted to work for Final Fantasy XV, and Shota conducted all recording sessions and contracted the orchestras and the choirs. Shota runs a group called Video Game Orchestra (VGO) that does rock symphonic concerts and operates in the recording industry. Yoshitaka Suzuki worked as composer/arranger, and Shota Nakama worked as composer/arranger/orchestrator.

Shimomura was responsible for at least 80% of the soundtrack the rest of the pieces are variations of her compositions that were handled by other people.

Final Fantasy XV: Original Soundtrack is mainly composed by Yoko Shimomura, who is known for her involvement with the Kingdom Hearts series.

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