Heh, I hit random a few times and bumped into #126577, some radio station in the US, and it reminded me why I stopped listening to the (free/open) radio.. so many ads it ruined it for me.
I got lucky and got BBC first, followed by a few random stations (Russia, India), and ended up listening to drum & bass on a French radio. I miss discovering music like this!
If you are interesting in geographically finding stations http://radio.garden/ is great