I'm hipster on the internet and not hipster IRL I guess?
the brony doc is supposed to be paid for (at some outrageous price), I'm sure you could find it by googling it but it's really probably not worth watching (and certainly not worth paying for).
I don't really hate the label "brony" but there's some negative stigmas attached to it. if you're a guy who watches a show about ponies it's not that bad, but if you're a "brony" then all the sudden people are like "SCUM OF THE EARTH." different strokes, whatevs.
sad music... gonna have to think on that one. one of my favorites is
luna's lullaby, which is pretty ancient in terms of poni stuff (coincidentally it came out on the very same day I started watching the show).
lullaby for a princess is unrelated but mostly considered the best out of the fandom and is pretty feels inducing