Okay...I'm working slowly on this. Here's our next baby step.
We've established that you all can construct diatonic triads...now lets add a seventh on top. SO: 1, 3, 5, 7 . No problem. Looks something like this:
Makes sense? Okay... See those symbols up top? Learn them...they're important, and mean great things.
In the case of major and minor, I will always use (for example) CMaj7 ... DMin7 . It's easier to read, more widely used etc. The triangle for major can lead to trouble if you try and write them quickly (looks suspiciously like a circle ) ...
...Okay, just wanted to put a bit more out there. I'm assuming this is basic revision for some of you? Stop me if I'm going to fast, ask me if something doesn't make sense. Possibly more coming soon. (I remember now why I hate jazz font...those symbols look
terrible, sorry)