Pandora is a project started on January 6, 2000 by a group of technologists who love music and musicians, with the idea of creating a comprehensive analysis of music. Therefore they called the project as The Music Genome Project.
Its purpose is to capture the essence of music at the most fundamental level. Similar to the human genome project, the idea is to classify music somehow analyzing the “genes” of each song: melody, harmony, rhythm, instrumentation, orchestration, arrangement, lyrics and others.
With this classification they have been able to take the next step: to provide personalized radio stations through the Internet; user suggests the name of a song and the page generates a radio station with a list of “genomically” music that was requested in the query (for legal reasons the requested song is not played immediately). The user has the ability to mark songs as they like or dislike and go personalizing their stations. You can also propose some new song, and even send music if the user is the author.
Pandora is only available in the United States, Australia and New Zealand. There is also a service that operates worldwide called Global Pandora (the service is not free).