I forgot my reppin' before.

Emo Guild
Emo 101
This is going to look kind of messy, here are extreme basics, with songs that I think do a fairly good job of showing each subsubsubgenre.
I AM NOT GOING TO DO A HISTORY OF EMO. FOR THE LOVE OF GOD, IF YOU WANT THAT, YOU CAN PROBABLY FIND 5 GAZILLION DIFFERENT ARTICLES ON IT ON THE INTERNET.
Rather than my pure opinion on emo, I'm going to sum it up with a bunch of different (credible)sources on emo, so I can still act elitist to people who read this and go soley off of this.
Emo=Emotive hardcore, emotional hardcore, emotionally charged hardcore punk.
Emo is pretty much a slower version of hardcore with softer, and twinkly guitars. This is normally A LOT different in 'emo violence', which tends to be fast, and with very harsh guitars.
OFTEN TIMES emo bands have songs filled with 'emotianal' lyrics which look like free verse poetry. This is not at all inclusive, because there are emo bands which have quite a bit of songs that are entirely political, or that don't seem to have that much of an 'emotional' sense to them at all.
"Founding" emo bands, or "the emo framers": Husker Du, Rites of Spring, Dag Nasty, Fugazi, Native Nod, The Hated, Union of Armogedden. That is about as much 'emo history' as I'll have.
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EMOCORE
Original emocore-Rites of Spring
Rites of Spring- End on End
"second wave" emocore(lighter)-Kerosene 454
(Even though they have an extreme post-emo feel to them)
Kerosene 454-Electrics on the Rise
"second wave" emocore(harder)-Antioch Arrow
(Antioch Arrow is often times placed in 'hardcore emo', but they remind me of a chaotic, non-awful Rites of Spring, so I put them here)
Antioch Arrow-Paper Moshay
Modern day emocore-Toru Okada
Toru Okada-Our Great Cities
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EMO
Original emo-Native Nod
Native Nod-High Tides in Alaska
"second wave" emo-Moss Icon
NOTE:
these bands were not that far off time wise, but for the sake of sound I'm going to put them as "second wave".
Moss Icon-I'm Back Sleeping, or ******** or Something
Modern emo-City of Caterpillar
(others will probably disagree, but they have far too much of regular emo sound for me to put them somewhere else)
City of ******** Hero
Science of Yabra-New Nemisis
Wow, Owls!-Houston, We Have a Drinking Problem
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HARD(CORE) EMO,
I personally think Hardcore Emo sounds like a ridiculous name, but I don't really have much of another name to call this section, just think of it as a 'harder emo'.
Emo violence-(I can't hear any difference between 'new', and 'old' so it will just be one category)Angel Hair.
Angel Hair-Witch Hunt Scene From Star Trek
Honeywell-You and Me
Emo power violence- Zann.
Zann-Maschine Mensch
Emo power violence tends to have much heavier instrumentals and the vocals have more of an effect like a punch, while emo violence vocals have the effect like being cut. You have to listen to it in order to understand what I'm talking about.
You can find some Zann songs on http://www.adagio830.de/zann.html
HARD EMO(for those who NEED to have the 'hardcore emo' bands in)-Saetia, The Khayambii Comminique(awful), Joshua Fit For Battle.
Calling Gina Clark-Leichen Sind Puppen Zabriskie Point
Saetia-Notres Langues Trumpet
Orchid- Destination: Blood!
Raein-The Tree
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POST EMO
To be completely honest, I have no idea how this ever became considered a part of emo. This is incredibly soft, often sounds like pop-rock, or powerpop, with maybe a few occasional girlish yells.
The most famous of these bands would have to be Sunny Day Real Estate.
A few others: The Get Up Kids, Jimmy Eat World(Static prevails), Mineral, and The Promise Ring(pre-Wood and Water)
BIG NOTE When I refer to bands as "second wave", I am NOT reffering to emo in waves, I am saying the original sound, the modern sound, and the 'second wave', is a band where you can hear the sort of sound changes into modern emo.
If you ever try arguing with someone about "third wave" and "second wave" emo, you're going to look like an idiot. Hell, if you base your opinion on emo soley off this post and try to argue, you're going to look like an idiot.