Pink Floyd's recent scathing op-ed against
Shares of the Oakland firm soared Tuesday after it said its service is now available in more than 100 car models, double the number it had a year ago.
So far, 2.5 million users have activated the service through integrations with automotive brands and aftermarket manufacturers.
The automotive market is important to Pandora, which has partnerships with 23 automobile brands and announced its first such partnership in 2010. About half of all radio listening happens in the car, the company said.
Pandora's stock rose $1.28, or 8.5%, to $16.41 on Tuesday.
On Sunday, the surviving members of the rock band Pink Floyd published an opinion piece in USA Today that accuses Pandora of trying to trick artists into supporting legislation that would lower Pandora's royalty payments.