We’ve seen Pandora set up partnerships with many of the auto OEMs, so this recent news on the growth of Pandora isn’t surprising.

His baby, the Pandora personalized online radio service, has more than 125 million registered users, a huge jump from 75 million at the same time last year. Pandora has expanded its reach into the car, with 16 alliances — including new ones with Kia and Acura — compared with four car companies this time last year.

Monthly listening, on average per user, is now at 18 hours, and shares of its stock are up 21% this year.

Coming off a successful $2.6 billion IPO in 2011, Pandora founder Westergren says the company is at the “tipping point” of expanding beyond the early adopters into a service that he says will one day be utilized by billions of consumers.

Once they can expand beyond the US, expect growth to accelerate.

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