Battle Arena Toshinden was one of the first games I can remember playing on the PS1. I recall playing it at a friend's house once for like 10 minutes, then we never played it again. So I don't remember much about the game, and for the past decade and a half I haven't thought about the series very much if at all. Then Brett Elston, formerly of GamesRadar, now working at Capcom of America, started a great podcast about video game music called VGMpire.
One of the first episodes was about PS1 launch games and the surprisingly consistent quality of their music. The first game they talked about was Battle Arena Toshinden and I was freaking blown away by how amazing the music they played sounded. I don't believe he played the song that I'm talking about today, but after I sought the game's soundtrack out, Eiji's Theme quickly became one of my favorite songs on my iPhone.
I did a little research about who composed the first Toshinden to see if I could find anything else by them, but all I could find was one or two of the game's sequels. Regardless, Eiji's theme is one of the most rockin', energetic songs that I ever heard in a fighting game, and as they point out in the PS1 launch episode of VGMpire, the songs in Toshinden are all like 3 minutes long but considering how short fighting game matches often are, you may never hear the whole song while playing. Anyway, without any further rambling, here's Eiji's Theme, courtesy of YouTube user Okuplok90: