That haunting snippet of music you kept hearing on NPR, between stories on “All Things Considered”? Thanks to npr.org and the internet generally, you were able to track it down within minutes and listen to the whole song for free, because someone had thoughtfully uploaded it to YouTube. But alas, aside from that snippet, the song had nothing to offer, and it kept offering it for more than five minutes over progressively more synthetic beats. You try listening to a couple other pieces by the same band, and they’re so horrible you can’t get past the first minute. You’re reminded of a woman you glimpsed once in a side-street for several seconds, and how she haunted your imagination for years thereafter. What does the imagination know? Just enough to be dangerous. But the internet — the internet knows too much.