When you listen to a Pandora Internet radio station, the site uses an algorithm to find music similar to the artist or song that you initially used to create the station. To further customize the station, you can seed it with additional artists or songs and use the thumbs up/thumbs down system to change the types of music played. To reset a station to its original state, you must remove the preferences you've previously set for it.
Select the Pandora radio station you wish to reset.
Click "Options" beneath the name of the station and select "Station Details."
Click the "X" beside each station seed, aside from the original seed, to remove it.
Expand the lists of thumbed-up and thumbed-down tracks. Click "X" beside each track to remove it from your preferences.