That said I just realised the assignment apparently focuses on the 2000s specifically. Which is incredibly dumb. Like, so dumb it refused to register in my brain the first time I read Bunny's post. Most of that music developed out of trends set in the '70s, '80s and '90s. And to a lesser extent the '60s. Most of the artists I mentioned predate the 2000s because it's a history of rock class, and it's pretty difficult to come up with a good historical synthesis of stuff that hasn't exactly had much time to have an impact yet.
All decades are represented by different groups. Mine was assigned specifically the decade of 2000-2009/2010. 60s, 70s, 80s and 90s are going to be represented by similar groups in a somewhat similar fashion. It sucks that I got saddled with the 00s but I'm not really complaining about it all that much.

I'm still going through this thread and looking at all the suggestions, as well as putting together information of my own gathering, so that's why I haven't really responded all that much. That and I've had a busy weekend otherwise.