The first question that must be answered when deciding to learn about classical music is what does it have to offer; why classical music?
One of the best articles I have read addressing this topic can be found here: www.theatlantic.com/culture. It is a three part article and each part brings something to the table.
Another great article can be found here: www.spreadinghappiness.com. Again it is a three part article, each attacking a different aspect of the question.