(WHAS11) -- If you spend a lot of time listening to Pandora on your mobile phone, you may soon be forced to cut back or pay up.
The streaming music service is introducing a new 40-hour per month cap for free mobile listening. Once you reach the 40-hour mark you can pay 99 cents for unlimited listening the rest of the month. You can also listen to as much music as you want like on your PC.
The move is an effort to manage growing royalty costs and is only expected to affect about four percent of Pandora listeners.