What radio stations are available with Prisma?

There are literally hundreds of radio apps that are part of the Chromecast built-in platform, with TuneIn radio being the most popular.  You can find a list of most of the applications available for casting at this link (you will need to hit the “show more” button many times in the Music & Audio section of the page, as there are many apps 😉 

Chromecast music and audio apps:  https://store.google.com/us/product/chromecast_apps?hl=en-US