The original Outrun is one of the most iconic games of all time, that's not really a controversial thing to say. Neither is saying that the series has some of the best music in racing game history, because even the original game taking its hardware limitations into account managed to put out some absolute bangers that with just some reinstrumentation could pass off as tracks of a modern game:
Out of these three, I think my favorite one is easily Magical Sound Shower. It fits the theme of Outrun perfectly, and coupled with the high speeds of the games it's pretty freeing to just blast through the tracks at 300 km/h with this sounding on the background.
So, what's your favorite track from the original Outrun?