We can help you combine accounts and then delete the account(s) you are no longer using. To start off, sign in to the account you've put the least amount of work into and start playing a station you'd like to copy to your permanent account.
Copy the link you see (ie: http://www.pandora.com/stations/play/999999999999999999) and sign into your permanent account, paste it in the window and Thumbs-up or Thumbs-down to save as your own station or keep it as a shared station.
If you have a lot of stations, the easiest way to accomplish all this may be to copy and paste all of them into a notepad/document first. That way you don't have to keep signing in and out of your accounts. After you are done, paste them individually from the document.
After all of this is complete, send us the email address(es) of the account(s) to delete. Please enter your Zip Code and Birth Year to confirm your identity.