CLARIFICATION: Ok, first, Beethoven was a Romantic composer stupid. George Gershwin is 20th century. Britney Spears is pop. Get a fucking music dictionary. Emo is a musical genre developed in the 80's. You don't hear people running around yelling "I'm so metal" or "I'm so rock." Emo clothing style was derived from punk which was rising from Washington in the 80's.
The attitude of "Emo" was derived from the agonizingly depressing lyrics that plague all of todays musical genres (which is why I listen to classic rock). This term I have chosen (agonizingly depressing) is a double negative for those of you lacking linguistics skills. The definition of the emotional status of the allegedly emo person could also be defined as adolescence. The emo label exists mostly among teenagers when they're going through normal chemical changes in their body.
The existance of this in older people is called depression and needs to recieve immediate medical help. This condition is rising among adults due to genetic mutations with the body's ability to balance seratonin and melatonin as well as increased stress in today's culture. Other triggers are tragedy by means of deaths or abuse. Many times this is reversable.
People that get labeled as being emo, and truely are, usually don't want to be labeled that way and it upsets them because of their nature. People that WANT to be labeled as emo are called posers. They're trying to become something other than what really are. We'll save "poser" for another definition.
Essentially, the term "EMO" is non-existant. It is slang that has been developed to describe typical chemical conditions. The problem is, teenagers do not understand what is happening to their bodies and so they label each other as being socially inept.
1: You're so emo
2: Waahhhhhh! Nobody understands me!
1: I'm so emo. I hate the world and nobody get's me.
1. Girls say they like "sensitive guys" (lie)
2. Guy finds out, so he listens to faggy emo music and dresses like a dork so chicks will see that he is sensitive and not afraid to express himself (lie). He dyes his hair black, wraps himself in a stupid looking scarf, develops an eating disorder, and rants about how "nobody understands".
3. Now an emo guy, he meets Emo chick and they start dating, talking about how their well-off suburban lifestyles are terrible and depressing (lie)
4. Emo guy is just too much of a pussy. His penis is too small, he's too depressed to bathe, and has more mood swings than emo chick, and he doesn't even have a menstrual cycle. Emo chick dumps him, saying "It's not you, it's me." (lie) as she drives off with Wayne, the school jock and captain of the football team.
5. Emo guy goes home and cries, proceeds to write a weak song and strum a single string on his acoustic guitar. Another emo chick sees how he is so in touch with his feelings, and the cycle continues.
This is the sad truth of the emo lifestyle/music, and now that I look at how pathetic it really is, maybe the emos DO have something to cry about!
boyfriend: I'm too sad to have sex.
girlfriend: I'm sad too; lets have sex and cry.
boyfriend: I'm already crying.
XxSlavetoAnguishxX: omg my gf just left me
acidburnedsoul: that sux man
XxSlavetoAnguishxX: i blame myself only i'm such an ass *cries*
acidburnedsoul: dude come over to my house and we can cut ourselves together
XxSlavetoAnguishxX: okay *cries*
acidburnedsoul: omg dashboard confessional has a new cd, i preordered it already
XxSlavetoAnguishxX: dude they're my favorite band to self-mutilate to
acidburnedsoul: i prefer to cut myself while watching Napoleon Dynamite on my bigscreen
XxSlavetoAnguishxX: dude that movie is so deep. i cry every time i see it
acidburnedsoul: me too. i hate myself
XxSlavetoAnguishxX: yeah we're such tortured souls, nobody understands how hard life is for us
acidburnedsoul: yeah we got it tough dude. pass the tissues
I just thought I'd clear that up after all of these "definitions" in which I have encountered an unbelievable amount of people who try to pass off their blatantly false pretenses as fact, and are slowly infecting others with their high-horse, holier-than-thou bullshit. Because honestly, with your ridiculous definitions, Beethoven, George Gershwin, and Britney Spears are/was "emo bands."
Now, onto the real definition.
In the early 90s there was a movement in the hardcore genre that came to be known as "Emotive Hardcore," spearheaded by Rites Of Spring. Harder-core-than-thou kids, who swore by Dischord Records a la Minor Threat, actually coined the term "Emo" as something of a put-down for the kids who really liked Rites Of Spring, Indian Summer and this new wave of "Emotive" Hardcore bands. That's right, "Emo" was once not something kids called themselves. The field exploded outwards from there - Level-Plane Records has always been the most famous Emo label. Acts like Yaphet Kotto, I Hate Myself, Saetia, Hot Cross, A Day In Black And White, Funeral Diner, I Would Set Myself On Fire For You, You And I, and hosts of others came in the next decade. Most emo bands have since broken up, but there's still the occasional hold-out (again, the majority of Level-Plane Records' roster has been a procession of emo acts). Like most DIY hardcore/punk of the time, a majority found its way onto vinyl and not much else. Some people consider bands like Fugazi, and later Sunny Day Real Estate, a progression of emo, but personally, I don't quite follow that philosophy.
Often, more recently, this gets intertwined with post-hardcore, and understandably so - that's nothing to make an issue of, since well shit, at least it's close.
Since the late 90s, though, bands have been emerging in the vein of Taking Back Sunday, Dashboard Confessional, and the thousands of their clones. As far as I can tell, some lazy journalist somewhere, writing an article about them, decided "Well, fuck, no one knows what emo is anyways, so I'll call these bands "emo" - sounds more appealing than bubblegum pop rock..." and the spiral continued downwards into the current amalgomation of bands MTV has told everyone is "emo."
Somehow, people decided that "emo" meant "emotional," which is obviously bullshit, as 99% of bands make music to illicit emotion, which would make "emotional" a completely all-encompassing genre from classical to opera to pop to rap.
Hope that helps.
Rites of Spring is emo.