Pandora will begin limiting mobile listeners to 40 hours of listening per month, the company revealed in a blog post today. The change was made in response to a rise in the royalty rates that the company must pay to record companies. Users who wish to listen to more than 40 hours per month can subscribe to the Pandora One service and get unlimited listening, as well as no advertising -- or pay a one-time $0.99 fee to listen as long as they like for the rest of the month. Desktop users can continue to listen to unlimited music. Most of you reading this will never hit the limit. In fact, it will affect less than 4% of our total monthly active listeners. For perspective, the average listener spends appro
