http://www.tandfonline.com/doi/full/10.1080/09298210802479284#.UecJmY3VAgE
http://en.wikipedia.org/wiki/Last.fm
http://blog.last.fm/2013/05/21/love-music-love-lastfm-love-music-videos
http://wp.clicrbs.com.br/ficaadica/2011/09/01/conheca-cinco-sites-para-escutar-musica-na-internet-de-graca/?topo=52,1,1,,284,e179
