MCR aren't THAT emo. I think they're more screamo. But they're good, so doesn't matter.

In my opinion, emo bands are bands that have awful lyrics describing their "awful depressing" lives despite the fact that they're rich, because of all the kids that buy their emo wristlets to cover up their emo scars because the want to seem cool.

Some bands like MCR have an emo sound to them, but aren't depressing and don't have awful lyrics.

But that's just what I think.

In any case, the following emo bands:

Dashboard Confessionals (Awful)
Linkin Park (Awful after their first CD. They're Rap Emo)
Coheed and Cambria (Just barely emo, but they rock)
The Used
Simple Plan (Pop Emo)
Good Charlotte (Pop Emo)

I'm probably missing a few...