Which of these bands do you consider is a rock band? in my opinion, Fall Out Boy is...my chemical romance is more alternative (trust me, i'm a mcr-aholic)
The Jonas Brothers are basic-pop. Panic At The Disco are baroque pop. Fall Out Boy are pop-punk. My Chemical Romance are punk-rock. The Beatles are, personally I see them as this more than rock, baroque rock.
I'd say Fall out Boy would be alternative-popish-rockish, MCR rock some way or another, The Jonas Brothers... some kind of Pop and I forget the other one.
Basically I consider it rock if my iPod says it's rock.
Jonas Bros are straight up pop. Fall Out Boy is more on the pop side (in my opinion) than on the rock side, same with Panic and MCR. The Beatles are straight up classic rock. So I voted for The Beatles. (but this is coming from someone who hates most new music anyway)
Plus, I like the oldies better than a lot of the crap put out today. Not saying all music today is crap, because there are many wonderful songs/ artists right now. I wonder what our musical legacy will be 50 years from now. honestly, I don't know how much memorable music we've put out. *sigh*