Someone on the planet may know more about rock and roll than Raechel Donahue, but it's doubtful. Because her husband, the late Tom Donahue, gave birth to the FM-radio revolution in the '60s in San Francisco, she's been on the front lines of the movement since before the beginning. And her presence on the staff of L.A.'s KROQ in the '80s, when it was establishing the blueprint for modern rock broadcasting, gives her firsthand knowledge of another important period in pop-music history. She shares this collected wisdom weeknights on the Mountain, transcending nostalgia to make the songs she plays seem as vibrant as they did on the day they were made.