Like I already wrote, the track titles for each of the boss themes in Sunset Riders are all translations of the lines spoken by each boss before battle.
For example: when you fight Simon Greedwell at the end of Stage 1, he says "It's Time To Pay". In the Japanese version, this is subtitled as もうおまえもこれまでだ。 ("It ends here for you")
The title of track 8 is titled "おまえもこれまでだ!", which happens to be the translation of Creedwell's line in the Japanese version (omitting only the "もう" portion) .
You can check the other lines at the Japanese Wikipedia.
http://ja.wikipedia.org/wiki/%E3%82%...83%BC%E3%82%BA