Question about KOF 3-in-1

[Knocks]

Hi, I just burned the 3 in 1 KOF disc, and I have a couple of questions about the origins of KOF 99 on the disc.

The default language in KOF 99 is Japanese, so I assume it was originally a JPN iso. However, it's suspiciously missing the anime intro when you boot the game. The intro is present in both the U.S. ISO and the Neo Geo ROM.

Also, the music before and between he matches is totally weird. It's some chick singing a slow song, definitely not KOF-style! In the original game it's supposed to be some electric guitar-type music. Was this stuff modified from the original, or what's the deal? Thanks.