Since it emerged in the 1990s, digital music has been hugely popular with fans, but for online music companies and their investors it has almost never been profitable.And yet the money has again started pouring in.Pandora, the popular Internet radio service, filed for an initial public offering in February that would raise $100 million. Spotify, a highly lauded European service, is reportedly raising $100 million from private equity firms to help it come to the United States.
http://www.nytimes.com/2011/03/01/business/media/01music.html