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The definition of audio search engines here is too restrictive. It really only covers searching metadata describing audio tracks. An audio search engine proper would allow audio queries in audio data; content-based rather than just metadata-based; searching audio vs. searching for audio. Possibly the reason for the metadata focus is that such systems are more widely available than content-based audio search. — Preceding unsigned comment added by 18.104.22.168 (talk) 13:42, 30 January 2014 (UTC)