Up from 40 million in December.
Pandora is a streaming music service that recommends tracks based on previous choices. It's had something of a second life on mobile after stuttering progress on the fixed web.
Pandora offers songs from over 90,000 different artists.
At the current rate of growth, Pandora should pass 100 million listeners at some point next year. And the service is also making money — which prompted a $35m cash injection last year.
Pandora is already available on a number of set top boxes and is also looking at in-car.
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