What is the easiest way to find and delete duplicate songs in iTunes? Possible Duplicate:
  Remove all duplicates on iTunes library  




A few days ago, I synced all of songs from my iPhone 4s to iTunes. After it finished, I found that some of them have duplicates. I thought maybe I transferred them to iTunes before. Now I want to find and delete them from my iTunes library. What is the easiest way to delete the duplicates? 
Thank you very much in advance.
There is a menu item for this directly in iTunes:



You may find additional utilities at Doug's AppleScripts for iTunes.