When I was growing up a muscle car to me was a "mid size" or larger body style car "usually" with a V-8.
The 2010 Camaro if I am not mistaken is considered a compact size car so should that take away the muscle definition of the car and lean it toward the pony definition? In other words, does the body size define it as muscle or pony as well?
My .02
http://en.wikipedia.org/wiki/Car_classification