So for those who didn't know Tetsuya Komoro = Daria Kawashima.
Tetsuya Komoro is a pun on
Tetsuya Komuro. She even created a copy band named CM Network for some CM songs...
Moonlight Densetsu is a "recycle" of "夢はマジョリカ・セニョリータ" from pop idol band KEY WEST CLUB.
The song existed before the anime but was commercially released after the anime single.
So, to avoid confusion, the melody was slightly altered in KEY WEST CLUB single version.
Here's KEY WEST CLUB original version of "夢はマジョリカ・セニョリータ":
https://www.youtube.com/watch?v=L0WjqRVknw8
Here's the 2nd version / single version (August 1992):
https://www.youtube.com/watch?v=2KjHDVRqgdM