Also, Gollum's senses had been sharpened by hundreds of years in complete darkness and silence, so he may have been able to hear or smell Frodo if his senses were acute enough, which they probably were after so long.
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"The other [theme] had now achieved a unity of its own; but it was loud, and vain, and endlessly repeated; and it had little harmony...and it essayed to drown the other music by the violence of its voice, but it seemed that its most triumphant notes were taken by the other and woven into its own solemn pattern..."
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