I think that romanization should probably prevail in most cases for Display#1, even on higher hierarchy than the english text found on CDs.
This is because romanized is 100% accurate (provided you romanize it correctly), while english text found on CDs is often full of typos or even less than accurate when it comes to translations.
Case in point: KICA 7760.
Display#1 should be the actual third line ("Gekka no Yasoukyoku")
We have english text here
http://vgmdb.net/db/covers.php?do=view&cover=33097
as Gekka no Nocturne, but I'd prefer to go with the romanization, since english clashes with other sources (ie from the game: "Nocturne in the Moonlight").