iTunes already killed off the need for carrying around stacks of vinyl. Now, it could further encroach upon DJing, rendering humans altogether useless. According to a patent application filed two years ago but just made public this week, Apple has been working on improving playlists. They would allow any iTunes-loaded device to interpret the beat of a song file, find the perfect song within oneâ€™s library to follow it, and crossfade the two together expertly. And while existing DJ something already performs similar functions, Apple could, of course, force a cease & desist if their patent came first.