Here is an idea for legally file sharing: Fair Use.
More specifically, "a quotation from copyrighted material when the
excerpt is used for teaching, research, news reporting, comment,
criticism or parody." (http://www.riaa.com/issues/copyright/laws.asp)
For example, a 3 minute song distributed over the internet from one
location may violate the copyright law.
But what about a 3 minute song divided into 3 second clips, accompanied
by a news report, comment, or criticism, distributed from 60 different
locations?