MP3 blog History

Among the very first MP3 blogs were Fluxblog and Stereogum. The latter began as a music-related LiveJournal in 2002, though its format was focused on indie/pop gossip rather than MP3s. Fluxblog's trumpeting of LCD Soundsystem's "Yeah (Stupid Version)" in early 2004 brought increased attention to MP3 blogs. A May 2004 story on National Public Radio[1] further galvanized the trend, and today there are thousands of MP3 blogs covering a cornucopia of musical styles.
A significant number of indie music labels, promotional agencies and hundreds of artists regularly send promo CDs to MP3 blogs in the hopes of gaining free publicity. Major labels with small acts to promote have also attempted to use MP3 blogs. In 2004, Warner Bros. gave permission for a song by their act The Secret Machines to be posted by the MP3 blog Music (For Robots). This drew attention not only for the song and the label granting permissions, but also due to the fact that several comments praising the track came from IP addresses within the Warner Bros. network. The publicity generated by MP3 blogs crossed the line from the internet to TV in early 2005, when Music (For Robots) was featured during MTV's Total Request Live program for bringing the Hysterics, a Brooklyn rock band composed of four 14 and 15 year-old high school students, to the network's attention.
Reference : http://en.wikipedia.org/wiki/MP3_blog