"People spend thousands of dollars on stereos. Sometimes tens of thousands. There is a specialist industry right here in the States which builds stereo gear to a standard you wouldn't believe. Tubed amplifiers which cost more than a house. Speakers taller than me. Cables thicker than a garden hose. Some army guys had that stuff. I'd heard it on bases around the world. Wonderful. But they were wasting their money. Because the best stereo in the world is free. Inside your head. It sounds as good as you want it to. As loud as you want it to be."