<http://schema.org/topics>
"contributor,digital music,features,grooveshark,guvera,ilike,imeem,Lala,last.fm,Lists,Media,Music,Music Lists,MySpace,pandora,rdio,spotify,vevo"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2009/12/25/music-industry-predictions-2010/>