This is an excellent piece of music from the theme tune to the 'Good Ending' of Oddworld: Abe's Exoddus:
The first twenty seconds of deep sadness as the clip shows the Mudokons who are still trapped and enslaved, then the melody changes and the remaining thirty seconds signify Abe and his fellow Mudokon's determination to find their missing brethren. It truly is fantastic game music.
The 'Good Ending' is achieved when the player saves 150 - or half - the Mudokons in the game. If the player fails to save at least this many, Abe is executed. Save the Mudokons!