<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54c83d3e5f3f2_-_front_speaker_before_big.jpg>
<http://www.popularmechanics.com/technology/audio/how-to/a770/3380301/>