"This is D major 7 as a barre chord. So what we're going to do is use our E major 7 open chord in order to do that. So what we have to do is just switch around our fingers here to get our first finger free. So you see I had it like this, now I change it to this, and I have my first finger free. And to make D major 7, I'm going to go all the way to the tenth fret. So here I am at the tenth fret. This is the E major 7 shape, but now we have D major 7, as a barre chord.
And we can also do that with an A chord. Here is A major 7, open. Just again, I'm going to flip that around so I have my first finger free. And this time I'll move it to the fifth fret - that's where D is. So here's the bar at the fifth, an A major 7, but now we've turned into D major 7 as a barre chord."