[Hoover]
Most people have a horribly limited idea of what emo is, simply because the most important records in the development of emo were largely released on vinyl, in small numbers, and with limited distribution. These were however very influential, so nowadays you have the situation that a lot of kids listen to third- and fourth-generation emo styles without even knowing it. I hope to expose such people to a wealth of great preceding music that's getting easier to find all the time...
I'm going to split up the mass of "emo" bands into a few distinct genres. Like any categorization effort, there will be exceptions, crossovers, and tangential relations. That's fine. The intent is only to lay out some general trends, general notes on sounds, musical and lyrical themes, and how to listen for them.
Some notes on nomenclature. There isn't a real consensus on what "emo" and "emocore" are, or if they are even different. It's pretty clear these days what you're talking about with terms like "punk," "postpunk," "no-wave," "hardcore punk," "old-school/new-school," etc (although the difference between "hardcore punk" and "hardcore" is lost on a lot of people - "hardcore punk" is punk rock made heavier, faster, louder; "hardcore" is what happened after the hardcore punks realized they didn't have to sound like punk rock anymore - still heavy, fast, loud, but with a different foundation.) I hope to draw clear distinctions between my categories, assign them names, and use them consistently. That's all that language is.