DJs are not musicians, although they do share some of the same 'crowd pacing' talents.
A musician is a person who plays a musical instrument. There are bad musicians and good musicians. You don't have to play first violin in the Cleveland Orchestra to be a musician.
The radio, CD player, records, etc. are not musical instruments, but methods to reproduce what musicians have already played.
Nope, strongly disagree. Did you read the bio and look at the course of the guy at Berklee? The name of the course is Using A Turntable As A Musical Instrument". Now I know just because a college professor says so doesn't make it so but still, this isn't the first time I've seen courses like this being offered. And this isn't something new, these courses have been around for years.
Plus (I'm making an assumption here, could be wrong) you haven't spent any meaningful time watching detailed demo vids about how to create a good DJ set. It's eye opening. I can't stand the music and you probably can't stand it either but force yourself to watch some of these and you'll grudgingly have to admit these guys are some kind of musicians. You have to spend the time, get into it, get some understanding of it before you can simply say what you said.
People on this forum keep thinking of the old "sock hop" scenario when it comes to DJ's. All they do is simply play records and make a few comments. No, no and NO. That's not all the best ones are doing. They're spending tons of time creating their own tracks at home first (sound familiar?), they get tracks given to them from established artists and they use software and hardware to manipulate them in ways you or I would never think of. They're creating something brand new from scratch live in front of a crowd. Isn't that called jazz? Not our jazz to be sure, but it's the same principle.
Bob