Pandora lets you listen to free internet radio as well as discover new music based on your tastes. I personally listen to it at work since it lets me discover new songs and artists based on my preferences.

How does Pandora Work?

Pandora was meant to be a Music Genome Project created by several musicians to deeply analyze music. They went on by analyzing different traits of a song by the instruments played, tempo, rhythm, melody, and more. They did this for many genres and hundreds of songs as well which makes up for their huge library of songs. Source

What does Pandora offer?

Pandora allows you to tune in to a station by typing in your favorite song or artist. Pandora will then most likely display a song from that artist or the song you chose itself. You may either give songs a positive, negative, or no feedback at all. You may even Pause, Play, or Skip the song. Based on your preferences, you’ll be receiving songs based on your taste.