THE HILLS
Because it's on MTV, you can hardly get through an episode of the vapid reality series without a current Top 40 jam playing (and, natch, a quick infographic flashes on screen, letting the impressionable masses know what it is). The theme song is Natasha Bedingfield's coming-of-age tune ''Unwritten,'' and more than a handful of her other tracks have been cribbed for background music, too.
