What Myth said: Darkness in Zero was mentioned in one of the Secret Ansem reports in 2.
According to Wiki it's Report #3.
Also Pride Lands is after Agrabah/Halloween Town... You can actually just skip it entirely though lol. Story doesn't care, but you do need to go through it to unlock Terra. I only learned that because they skip Pride Lands, Atlantica, Olympus 2 and Space Paranoids 2 in Any% runs lol
Skippin worlds is lame, nevertheless
ANYWAY here's today's (yesterday's) banger
tbh prefer the other two RIOT songs I've listened to.