I just want to clarify something for my Grimes advocates but moreover for all of you aspiring DJs who've been keeping up with Grimes' miscarriage of DJing. Human perception of time in terms of beats per minute is extremely malleable. Since the human brain focuses best on one thing at a time, factors such as focus, pressure, etc., will radically alter your perception of tempo as you're DJing. Unless you're counting beats in your head while simultaneously running a stopwatch till it hits 60 secs, it is impossible to mentally calculate a song’s speed while simultaneously DJing, which by the way was Grimes' biggest mistake and whoever "taught" her how to "DJ" failed her tremendously. But I digress. B/c of the level of multitasking involved with mixing, it's important to use headphones as they allow us to sonically crack the puzzle of bpm instantaneously. DJing takes a very high level of aggregation b/c you're listening to the music playing out of the venue house speakers, monitoring the song playing in your headphones, and making the necessary adjustments on your Turntable/CDJ/Controller's pitch control until both songs lock together in speed. We call this mixing by ear and it's the most fundamental skill a DJ can have. I wish Grimes luck next weekend b/c if she doesn't learn how to accomplish a mix left to her own devices by the time she steps back up on the Coachella stage, she risks experiencing the same catastrophe.

DJ question. Does anybody else have a “pace car” when they DJ? Like I always zero in on one person (usually the best dancer) and I’m really just DJ’ing to that one person for alot of my set.