From In Post-CD Era, Gracenote Makes a Big Business of Content Recognition:

Gracenote's music recognition technology is embedded in the infotainment systems for 35 million vehicles.
Gracenote’s music recognition technology is embedded in the infotainment systems for 35 million vehicles.

Gracenote’s music recognition technology is embedded in the infotainment systems for 35 million vehicles. Image courtesy of Gracenote.