ok I found the link to that song, the download is free.
http://www.nobuouematsu.com/main.html
go to this link, on the left side there are some drop menus. drag down the "download" drop menu and select music. on the next page click "MP3", there should be a file on this page called the best of Final Fantasy VII. it's a live performance and kicks serious ass. if you are a fan of final fantasy or classical you will love it.