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Shazam Entertainment is a company that provides a commercial music identification service through acoustic fingerprinting. A user calls a telephone number provided by Shazam while the music to be identified is playing. If the music can be identified by comparison with Shazam's database of audio files, an SMS with the information of the tune is sent to the user, and the user is charged a service fee. If the music can not be identified, no fee is charged.
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