I've come across just about every conceivable kind of format since broadcasting over the Internet became a thing, but here's one I haven't heard before - all Beach music all the time. 

In case you're not familiar with it, Beach music doesn't refer to people like Brian Wilson and his ilk. Instead, it's a certain kind of southern style that became popular in the Carolinas in the late 50s and 60s. Beach Waves Radio is unusual in that it has actual disc jockeys (part of the time,) jingles and liners (and even spots), unlike many such online only outlets that just play automated music and nothing else. 

It's not for everyone, but it's unique enough that some here may appreciate a respite from the same old oldies to hear - you should pardon the expression - new old oldies! 

Beach Waves Radio