Two qualities are indispensable: first an intellect that even in the darkest hour retains some glimmerings of the inner light which leads to truth and second the courage to follow this faint light wherever it may lead.
I listen to KCRW in the car and Pandora radio which I stream through the stereo from my iPhone. I've been listening to everything from Caribou to Conway Twitty. If I'm going on a longer car ride I'll download some podcasts.