Previously known as Pandora Radio, Pandora is an online music service launched on August 25, 2005, from Tim Westergren's Music Genome Project. It allows anyone to create a radio station based on an artist they enjoy. Once a radio station is created, Pandora picks songs and artists that relate to that artist. Also, it takes into account the ratings you give different tracks while listening to the service. This feature makes Pandora one of the best locations to find new artists and types of music you enjoy.
The basic, ad-supported service is available for free. Subscribing to Pandora One removes ads. It also lets you listen to songs of higher audio quality and play any song on-demand.