https://techcrunch.com/2019/06/05/every-final-fantasy-soundtrack-is-now-on-spotify-and-apple-music/

Just in time for your road trip to LA for E3, Square Enix has suddenly made the soundtracks to every main Final Fantasy game available for free to listen to online. Just log into Spotify or Apple Music and search for “Final Fantasy original soundtrack.”

I just checked and Final Fantasies I-XV and some sub-sequels are all there, some in original and remastered versions, plus plenty of popular (or not) side titles like FF Tactics (come out on Switch already!) and Type-0. There’s even the soundtrack for the ill-considered 2001 movie, The Spirits Within.