<http://schema.org/about>
"Peter Dykstra counts down his top 20 eco-songs. Ozzy Osbourne, Metallica, and a few other strange bands make the cut."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/gadgets-electronics/stories/mother-natures-greatest-hits-20-songs-with-an-environmental>