“Listeners create a station simply by typing in a song name or artist, and Pandora launches a radio stream, playing songs that have similar attributes to the individual user’s selection. Each listener can then fine-tune the personal station, giving a “thumbs up” or “thumbs down” to songs, and Pandora responds, paring the attributes more specifically to the user’s taste. Conversely, users can add more music to expand the musical gene pool. Listeners can share their personally created “radio stations” with others by e-mail and can also view top stations being played.”