It makes sense to me with Bluetooth because the sound system and device are connected. But when it’s regular radio, how is it receiving and displaying this information?
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Most modern radio stations on FM now also send a digital signal with the radio signal that allows them to do a few things, one of them is display that info. If your radio supports it. Another thing is HD Audio, if your radio supports it.
So if you are tuned into a modern station, you can get that info.
This is only possible when the car’s radio is a DAB+ (Digital Audio Broadcasting) compatible device. Sending data digitally across the radio spectrum enables (among other things) *data casting*, which is the inclusion of additional information about what is being broadcast. Notably, there are DAB+ compatible radios that are standalone devices too, not just used in cars.
When radio stations license a frequency, they don’t just get that frequency. Instead they get a band around the primary frequency. This was originally intended to prevent interference between different stations. However, the stations don’t need the entire band that they have to broadcast the audio signal, and so they use a technology called Radio Data System (RDS) in Europe or Radio Broadcast Data System (RBDS) in the U.S. to transmit additional information on a small portion of their licensed band.
FM radio transmits text data through a protocol called Radio Data System, or RDS. The data is superimposed onto the FM signal, and radios with the decoder chipsets can display it.
For a more In-depth explanation, here’s the [wiki](https://en.m.wikipedia.org/wiki/Radio_Data_System).
Song metadata gets broadcast along with the song itself from the radio station, and receivers that have the feature to display song title/artist do so
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