Raices, Centro Leon's radio station is mostly easy listening which despite what some people say, is not classical music. However, they do broadcast a classical concert every evening at 9pm, according to
their site.
Here's a good directory of DR radio stations:
www.teoveras.com.do/radiowebindice.htm
I'll check out Quisqueya - sounds better than La 91 which I usually have on in the car, but it's generally too bland for my tastes. I used to like Viva FM which no longer exists.