"T0100NAR" and the likes are the episode titles used in Budokai's Story Mode. < This is for the English and Japanese audio tracks.
"DBGM00" is _Rock the Dragon_ opening theme for the NTSC-U/C version. "DBGM01" is _CHA-LA-HEAD-CHA-LA_ opening with a beep at the beginning, and "DBGM02" is the EUR opening theme song. < This is for the U.S. Soundtrack Gamerip.
I don't know if there is any difference between the EUR and USA scores, and even though I assume they're pretty much the same with a few files differently named here and there and such, I'm still going to keep both.