One way to narrow down your list of relevant resources is to ask yourself who cares about your topic. Remember the student who wanted to research the legality of downloading music from the internet? Her next step would be to create a list of industries or groups of people who may have an interest in the subject:

Music industry Musicians University administrators Lawyers Students Politicians

Automobile industry Civil engineers Farmers Surgeons Hockey players Plumbers

Based upon this list, she can look for information published by or for the groups listed on the "who cares" side, such as government documents, legal documents, music industry web sites and college newspapers