Final Fantasy I was the first Final Fantasy of the series (DUH!) and it was on the original Nintendo. It has a pretty basic plot line in which you have to restore the four orbs to save the world. Overall, It was a good game for its time and it also had great music as all Final Fantasy's do.
Since they are of Nintendo origin, they can be a tad bit repetative. Nonetheless, it is still great for video game music.