There is this https://en.wikipedia.org/wiki/Radio_Data_System

In some cars i can see display of the song name.

It's also possible to turn a raspberry pi into an FM transmitter. http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspb...

There have been several schemes over the years for using FM broadcasts for data. In the early 80's, you could hook your home computer (Commodore 64, etc...) to the headphone jack of a radio and late at night some stations would carry a program that would send data. It sounded a lot like an old-school modem.

In the mid-90's I had a TV set-top box that gathered TV guide information over an FM data subcarrier. The company went out of business.

These days, data over broadcast is done on TV channels instead of FM because the bandwidth is larger. There's one of these operating on channel 20ish in Houston. I have no idea what data it's broadcasting.

Most certainly, it is what drove data to Microsoft SPOT watches: https://en.m.wikipedia.org/wiki/Smart_Personal_Objects_Techn...

I still have a few lying around, though the data service has long since been turned off. It was low-bandwidth, but suitable for stock prices, weather, and incoming-only text messages via (IIRC) MSN Messenger. Cell phones have since replaced the functionality, but I loved mine at the time.

Yes, DARC is used to broadcast public transit arrival times over one of the public FM radio stations in Stockholm and Helsinki (and probably other places): http://www.windytan.com/2013/11/broadcast-messages-on-darc-s...

You can, but it will be really, really slow. And one-way only of course.

HAM operators have been using that since the 80's (maybe earlier?), broadcasting data, pictures (i.e. SSTV) or text (i.e. hellscreiber)

I am curious if the FM chip is able to listen outside of the typical 88-108 MHz.