The following can be unlocked by reaching certain ranks in the Journey and are available from the Genre Box:
-
ランク17: ライディーン - YMO
Rank 17: "Rydeen" - YMO (Yellow Magic Orchestra) -
ランク18: ベビーメタル - BABYMETAL
Rank 18: "BABYMETAL" - BABYMETAL
Other songs are displayed in rotation in the Music Library.
They can be found in the International Box.
There is also a chance to get them from leaderboard events, so make sure you check the events regularly!