From today’s TRI Newsletter: Tim Westergren, the founder of the Internet radio service, tells the L.A. Times that since more than half Pandora’s usage now comes from smartphones, he’s focusing on the 8.5 hours a week that Americans listen to radio in their cars. As he puts it, “that’s the Holy Grail.” Westergren says “We’re actively developing software products with car manufacturers and after-market stereo companies such as Pioneer and others. We’re already working with Ford, Mercedes and other companies that we can’t talk about now.” Pandora already has some in-car usage, even where it’s not very convenient. Westergren says “half of the 20 million people who have Pandora on their iPhones use it in the car. But we can’t promote that kind of usage because of the safety concerns involved when you’re driving and trying to control your phone at the same time.” The answer is another “build-in” – “the future is in being able to control Pandora right from your steering wheel.”