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To celebrate Utada Hikaru's new album scheduled for release in 2018, as well as doing a live tour across Japan in the same year (which she hasn't done since 2006), it has been announced that all of Utada Hikaru's songs from "Automatic" (released in 1998) to her 6th album, "Fantôme" (released in 2016), are now available in music subscription services in various major platforms (such as Apple Music). Spotify, however, will get the songs on January 8th. Included among the songs available are the two main 'Kingdom Hearts' themes, "Hikari/Simple & Clean" and "Passion/Sanctuary".

EDIT:

It appears that North America (U.S., Canada, and Mexico) won't be getting the songs on Spotify.