Ai Weiwei, one of China's most controversial artists, looks on during the 'So Sorry' exhibition opening at 'Haus der Kunst' on October 11, 2009 in Munich. Miguel Villagran/Getty Images hide caption

itoggle caption Miguel Villagran/Getty Images

Game industry analysts say the number of hours spent playing video games is increasing by about 8 percent each year. iStockphoto.com hide caption

itoggle caption iStockphoto.com

InBflat.net features 20 YouTube videos of people playing instruments in the key of B flat. inbflat.net hide caption

itoggle caption inbflat.net

Companies offer services as varied as song streaming, concert ticket sales and music downloads using business models ranging from subscription to free-if-you-watch-an-ad. Courtesy of Pandora, Songkick, Rdio, Rhapsody, eMusic and Spotify hide caption

itoggle caption Courtesy of Pandora, Songkick, Rdio, Rhapsody, eMusic and Spotify