There are also a few "nostalgia/standards" public radio stations.
Probably the most common format in number of stations (although those tend to be smaller markets) is (for lack of a better term) "Variety" or the so-called tent-poles format. NPR News in morning and afternoon drive, classical music in between, jazz in the evening, plus some other odds and ends.
Quad: Why the raised fist toward FCC headquarters? The problem is not enough formats, it's not enough stations. And both AM and FM bands are already too crowded. Besides, every format imaginable is available on the Internet. Which is why Internet radio will supplant terrestrial radio, just as Internet book stores supplanted brick and mortar bookstores.