If you visit band or lyrics websites, you may often see extra tracks in discographies described as being 'Japanese bonus tracks'. This is in part due to CD prices in Japan. To stop shops from buying cheap from abroad, the Japanese version may include an extra song.
Lost Prophets, OutKast, Sonata Arctica, Pain of Salvation, Less Than Jake to name some of the artists with Japanese bonus tracks that come up first in a Google
If you're someone like me (one who feels incomplete without having every album/EP/song from a band) these can get EXTREMELY annoying. For some reason which I don't know (I was told by a friend that it was some sort of agreement Japan had with the music industry) they always get them.
Person A: YES!! I finally have every song by DragonForce!
Person B: I think you forgot about those Japanese bonus tracks that appear on all their albums.
Person A: What?
Person B: You don't have 'Where Dragons Rule', 'Cry of the Brave' and 'E.P.M.'.
*Person B walks away*
Person A: My life is over *sniff*
*Person A pulls out a gun*