I remember indie *sigh* , they still have an indie night at a nightclub near me, tis great, playing all those bands that dont exist anymore

Still fun though
Indie is refered to the label, but it kinda evolved into a sound too, some people would say that oasis, blur, pulp and all those were the height of indie, but its hard to say. Kaiser Cheifs i would say are indie, but its all down to who you ask.
Pop is popular music, but you could also say that now has a defined sound, like kylie and all those kind of people.
Rock is rock man \m/
I think as far as coldplay are concerned they were indie but have now moved on to other things.
As for emo...i have nothing to say, it leaves me speachless and slightly ill
Theres so many genres now, it confusses me, a friend of mine is a little emo kid, bwess her. She tells me of emo hardcore screamo, and other random made up words put together that are meant to be something...maybe im getting to old and losing touch with the kids of today, haha!