A remix of “DAN DAN Kokoro Hikarete ‘ku” (the original Japanese opening theme to Dragon Ball GT) can be found for purchase on the American iTunes Store.
The track is from the “Anipara Club – Para Para Dance No. 1 CD” released by I Love You! Project on “Anime Records” on 25 October 2005. The song sounds like an American trying to sing in Japanese. I can not find an entry for this CD on either Amazon or CDJapan, so I can not even tell which country it is originally from — seems to be more American in nature, though.
If you are looking for some new music to listen to, check it out. It is only 99 cents, so it is not going to burn a hole in your wallet. Be aware that you must have an iTunes account (and the iTunes application) in order to purchase and listen to the song.