The point of this post, however, is not to bemoan the fact that you can't have the song. It's to show you three things: that mashups can be more than the sum of their parts, that Hard Rock Sofa can do some seriously massive stuff when they set their minds to it, and that a technically unrelated song can stick something like the theme from Knight Rider straight into your head for days.
I've listened to so many mashes of Daft Punk's Harder, Better, Faster, Stronger that I'd rather forgotten what the original sounded like. In truth, it needed a little heavy added to the background. Then along comes Hardwell with Quasar in hand, cranks up the bass, and voila! We get something better than either of the two originals.
However, Hard Rock Sofa either sampled the Knight Rider theme when they made Quasar or they were inspired by it because that's all I can think of when I hear either the original or Harder Better Faster Quasar. For today I've brought all four of the songs together for your musical edification, my darlings. Do let me know if you agree with any of that blather or if I'm daft and should just go back to my sofa.