Quote Originally Posted by Kawaii Ryűkishi
The song ("Prologue") is featured in FFI-IX, not just FFI and FFIV. And it didn't have lyrics all along: that vocal version was created specially for the commercial.
I don't remember hearing "Prolouge" in any other FF than I and IV. They really should have thought of different names for the "Prelude" (played on or before loading screens) and "Prolouge" (As far as I know played during the scrolling text in I and IV) tunes. Of course, I'm probably wrong knowing you.