You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Music-Download Sites Seek Marketers' Money Last.fm, Qtrax Both Think They Can Turn Once-Illegal Activity Into a Business By Andrew Hampp, Published on January 28, 2008 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.