Emo

Emo was a genre of music that developed out of the failing straight edge movement, especially in the DC area when bands such as Minor Threat and Bad Brains began to lose popularity.
These bands decided to take the energy of punk rock but without the anger, creating emo. Bands include: rites of spring, indian summer, some fugazi, ect. During emos height (84-87), it was generally very emotional, fast, and powerful music. Eventually, it became influenced by pop (much like punk) and is what it is today. It has also become a term to describe someone who is depressed and overly emotional, generally for attention.

I was wondering how Rites of Spring and My Chemical Romance are both labeled Emo and are completely different.