There's no one answer--there's no single model of a Volvo or one factory stereo system. Chew on these: edmunds.com/volvo/xc60/2010/review.html reviews.cnet.com/suv/2010-volvo-xc60/450... usnews.rankingsandreviews.com/cars-truck... diymobileaudio.com/forum/diyma-build-log... Upgrades usually mean costs. You may be able to do it cheaper if you take the factory stereo and get an upgrade through a car audio place--ask them first.
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You can find the all essential parts for music system such as sub woofers, amplifiers, cd players, cd changers. buyautoparts.com/autoparts/Volvo/Radio_o....
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.