Well programmed and, I'm thinking, well researched. They identify themselves as playing hits from the 1970s and 1980s. However, if they know of songs that are evergreen outside of those two decades, they'll consider and play them. Yesterday, I heard the Beatles version of "Twist And Shout" (1964) This morning, I heard "Brown Eyed Girl" by Van Morrison (1967). A lot of listeners don't really know, or recall, or even care, exactly when a hit song they like was released. Makes sense to me.