It's not a hard work that you can have a try powerful program Leawo Tunes Cleaner. Leawo Tunes Cleaner
is the Windows based professional iPhone cleanup software that could act as iPhone duplicate remover, iPad duplicate remover, iPod duplicate remover and iTunes duplicate remover to help you easily find and remove duplicate songs from iPhone, iPad, iPod and iTunes in clicks. And it help you fix your iTunes music library and other music folders by adding song tags and removing duplicate songs.If you're interested in it, please free download it and have a try
1. Download, install and open Leawo Tunes Cleaner. Choose the "Clean-up Duplicates" option on the main interface.
2. Select a duplicate scanning mode to detect duplicate songs in your iTunes from Quick Scan and Deep Scan. Quick Scan mode is based on song tags including name, artist, album, file size and time, while the Deep Scan mode adopts Accoustic Fingerprint tech for deeper scanning. Choose desired one.
3. Click "Scan iTunes" button to start scaning duplicate copies in your iTunes music library.
4. Via scanning, all duplicate songs would be displayed. You could play back all reference duplicates and determine which file to keep and which file(s) to delete. After selecting which files to remove, click "Remove" button. Tunes Cleaner would immediately delete all duplicate songs.
After you have removed all duplicate songs from your iTunes, sync your iTunes library to iPhone via USB.
For more details, check: Three Helpful Ways to Delete Duplicate Songs on iPhone