You ever been to a party and, for some reason, it's hard to get a handle on the vibe of the room? I'm not talking about the visual representation of who's there (or who's not), but more the collective energy surging through the space is just ... off.
It's taken me a few years, but through my vast research, I've concluded that eight times out of 1o, this amorphous feeling is a consequence of the DJ switching up their music selection too quickly. You can always spot a rookie DJ by an ill-timed switch up. You gotta be able to transition accordingly.