This mod adds the tracks from earlier versions of Factorio, as recreated by ruhroh, to the list of ambient music that it plays. These are encoded at much higher quality, and therefore do not suffer the problems of the originals.

See ruhroh's forum threads for more information about the music itself: Sepro1 now in HD! and
Original Factorio Intro (song) Now in "HD"!.

You can listen to the music at soundcloud.