This article was interesting as it provides some details about the technologies used for BMW's Connected Drive...
https://arstechnica.com/cars/2017/05...t-megahertz/3/
If you go back to the intro on the first page there's a paragraph on Pandora, which BTW doesn't work (BMW link on the linked page)
...
For a look at what car support in 2017 looks like, check out Pandora's insane
"How to listen to Pandora in the car" support page, which lists all of its disparate pack-in clients