Pandora is an online service that recommends songs to the listener based off of a starting choice. The primary goal of the service is to provide the listeners with songs that they may or may not know that they like. Pandora is able to do this through the Music Genome Project, a comprehensive analysis in which data was collected on a large quantity of music and compiled into a database.  The Music Genome Project has 400 musical traits for every song entered in the database that it uses to bring listeners similar music to their initial song choice. Thus, when a song or artist is chosen on the service, data is pulled from the Music Genome Project to identify the next song choice.
Pandora is only available in the Unites States, Australia, and New Zealand.  The service is owned by the company Pandora Media Inc., and it offers the product as an application on most smartphones. Pandora is offered in two ways. Users can listen for free with advertisement, or they can subscribe and fully join the Pandora community with an advertisement free experience. Also, Pandora allows users to jump from the service to another location, such as iTunes, where they can purchase the songs they are listening to.
Pandora does not have a featured medium to communicate directly on the site. The most communicative feature on the site is that users are able to follow the music feeds of friends and comment on their selections. In this way, users can discuss music they enjoyed or hated.