Various systems and methods described above permit a user's content experience (e.g. music playing experience) to be monitored and for metadata describing this experience to be collected. This metadata can be dynamically updated as a user experiences media content and then used to impart to the user...http://www.google.com.au/patents/US20050050079?utm_source=gb-gplus-sharePatent US20050050079 - Methods and systems for per persona processing media content-associated metadata
