links:
How has youtube change the music market/industry?

pag1: http://ireport.cnn.com/docs/DOC-1208397

pag2: https://eshellem.wordpress.com/2013/12/12/how-youtube-changed-the-music-industry/

pag3: http://www.hypebot.com/hypebot/2012/10/how-spotify-changed-music.html

video: https://www.youtube.com/watch?v=e_vLdNRQyDk