<http://schema.org/headline>
"Snoop Dogg, Radiohead, Dr Dre, Black Keys to headline Coachella 2012"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/music/news/a359238/snoop-dogg-radiohead-dr-dre-black-keys-to-headline-coachella-2012/>