Apologies for the triple posting, but I'm going to talk about the 30th Anniversary Music Collection, a major reason to why I bought the Deluxe edition on Steam. (And this sucker took awhile to download...)
Exclude Burning Soul and Don't Think, Feel (both have different versions), there are unreleased tracks that were made, especially from Virtua Fighter 2, which had me curious.
Those tracks are... the Arcade music from the Model 2 board! Basically, that told me that SEGA AM2 had made 3 different original versions of VF2. Why I said 3 versions? The original album of VF2 music were in super higher-quality (higher bass, tremble and drums and using the SFX and VAs within the music), in contrast to the console version release, later released a year later in the Virtua Fighter 1 and 2 double album and used as of right now.
From what I can tell you, the "unreleased" tracks are rough. Best example is Pai's theme, Star of Hong Kong: right at the beginning of the track, there's a thunderclap sound used unliked its console version. The tracks are similar to what Team Ninja released for Dead or Alive 1 album when it first came out: rough as hell! The Saturn version didn't even have an official CD release until many years later when Dead or Alive Ultimate came out. Note: however, the PSX version did got a CD release but majority of the tracks were different, i.e. Zack and Jann Lee and some have extensions: Tina.
Interesting enough, SEGA did NOT add the 16-32 bit music of Virtua Fighter (32X) and the ill-fated Virtua Fighter 2 (Genesis) into this collection. Unlike others did like Capcom, for somehow out of the blue, released albums of the SNES and Genesis music of Street Fighter II (all of them: WW, Turbo, Special Championship Edition and Super, and yes, the Genesis version of SSF2 included) a couple of years ago. Now I said that because the VF2 intro song, "Begin New Challenge" has 2 different versions combined as one track: one was a MIDI version, which suspiciously sounded almost like the Genesis version and another rock-based beta of it.
Also included were 3 exclusive tracks from the Japanese VF2 PS2 version that never had a CD release, the VF.TV music, a couple of more beta tracks for VF3 (although, they didn't add the beta version of Pai's theme, there were 2 different versions: one from the Model 3 tech demo and from the prototype video with the different costumes for Pai and Aoi) and VF4. Virtua Quest music was also added.
My only gripe is that they also should had added in Dancing Shadows album (VF2 image songs) and the VF3 On the Vocal.