Mysterious trance song
 

Please, can anyone help me find this song? It's a trance song that starts with a piano instrumental and thunder/rain in the background. It slowly speeds up and becomes a trance song. No words. I heard it, you won't beleive me, in a background of a porn video, but the video was erased from the internet aparently, due to copyrights, but not because of the song, but for the video itself.. It was at least 7 minutes long.
The pure trance portion of the song sounds a bit like those african tribe songs, but electronicaly altered.