Answer:
What gets colder as it warms up?
I'm often served as a "rack of ..." I'm often smoked or grilled, with bones in, and slathered in BBQ sauce.
What has been around for millions of years but is never more than a month old?
What comes in many varieties and can't be seen or touched, but it often makes you move?
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
I am a rock group with four members. All dead one was assassinated.