An MP3 blog is a type of blog in which the creator makes music files, normally in the MP3 format, available for download. They are also known as musicblogs, audioblogs or soundblogs (the latter two can also mean podcasts). MP3 blogs have become increasingly popular since 2003. The music posted ranges from hard-to-find rarities that have not been issued in many years to more contemporary offerings, and selections are often restricted to a particular musical genre or theme. Some musicblogs offer music in Advanced Audio Coding (AAC) or Ogg formats.
Among the few first MP3 blogs were Tonspion, Buzzgrinder, Fluxblog, Stereogum and Said the Gramophone. Tonspion is the first MP3 blog in Germany and started in 1998 with reviews and downloads that international artists and labels gave out for free on the web. Buzzgrinder began in 2001 as a way for musician SethW to fill time on the road. Stereogum began as a music-related LiveJournal in 2002, though its format was focused on indie/pop gossip rather than MP3s. Fluxblog (also founded in 2002) trumpeted LCD Soundsystem's "Yeah (Stupid Version)" in early 2004 brought increased attention to MP3 blogs, while Montreal-based Said the Gramophone, founded in 2003, was among the first websites to write about artists like Arcade Fire, Wolf Parade and Tune-Yards. A July, 2004 story by Reuters and an August, 2004 story on National Public Radio 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 because 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.