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Systems and methods are provided for monitoring transmis sions of media content (Such as audio and audiovisual con tent) in order to obtain independent and objective data regard ing the use of specific media content recordings or works within the transmissions. Processing and reporting of Such data is provided in various ways to serve a variety of business needs. Methods for employing content identification technol ogy to efficiently and automatically obtain reliable, accurate, and precise monitoring data are also disclosed. Various infor mation products and services based on Such monitoring sys tems are proposed.