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.