Help identify this classic melody

I have a really old pack of midi files on my computer, "628 Trance tracks". It contains midi for old tracks like Ayla, ATB, etc.
In it, I have a few files titled "(bassline)", "(mainlead)", "(piano)", etc. I would love to know where it comes from.
All I know is, the midi is modified 2004-05-31, so the track must be older than that.

Put together, the mainlead and bass sounds like this: https://soundcloud.com/pikzel/unknown-melody

Any help would be greatly appreciated.