Pandora Internet Radio (also known as Pandora Radio or simply Pandora) is a music streaming and automated music recommendation service that serves as "custodian" of the Music Genome Project.
The service plays musical selections of a certain genre based on the user's artist selection. The user then provides positive or negative feedback for songs chosen by the service, which are taken into account when Pandora selects future songs.
Pandora Player provides a shortcut which opens the Pandora website in a new border-less window as shown on the screenshot. It's simple, minimalistic and fast.
Disclaimer: "Pandora Player" is not affiliated with pandora.com
You can access the source code at: https://bitbucket.org/mariosevr/