Sometimes, during the lonely hours on the control deck, Bowman would listen to this radiation. He would turn up the gain until the room filled with a… - Arthur C. Clarke

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Sometimes, during the lonely hours on the control deck, Bowman would listen to this radiation. He would turn up the gain until the room filled with a crackling, hissing roar; out of this background, at irregular intervals, emerged brief whistles and peeps like the cries of demented birds. It was an eerie sound, for it had nothing to do with Man; it was as lonely and meaningless as the murmur of waves on a beach, or the distant crash of thunder beyond the horizon.