http://www.pandora.com/

The Music Genome Project is an in-depth study of music to capture the identity of a song.  Over 5 years, the project carefully studied songs from over 10,000 artists and assembled data which they categorized into genes.  Each gene defines a characteristic such as melody, harmony, arrangement, and lyrics which combine to form the unique identity of a song.

The MGP has released Pandora, an interactive internet radio station which recommends and plays songs based on your likes and dislikes.  Entering a simple search term for an artist or song you like, and the internet radio station will offer artists it thinks you may also like.  Simply click on the currently playing song, select Thumbs Up or Thumbs Down and the recommendation will continue to be tailored to your tastes.  You may discover some songs and artists that you hadn’t heard before.