① ① The ①①itunes software tool is just a synchronization tool between the computer and the iPhone. There is no delete button, only the sync button. So we need to find a synchronized computer folder to empty the music in the folder, or just delete the unnecessary music files and synchronize them to the iPhone, so as to delete the promotional videos on the iPhone.

? ② Open itunes, select "Music" and click the "Sync Music" button, and a dialog box will pop up "Are you sure you want to remove the existing music, movies, TV programs, books and ringtones from this iPhone and synchronize with this itunes material?" The data folder on the computer will be synchronized with the files in the iPhone, and the files in the computer data folder will be uploaded to the iPhone as the result of synchronization.

? ③ Select File-Database-Organization Database. Check the Unified File button and locate the iTunes Media folder.

? ④ Taking XP system as an example, the default path of iTunes Media folder is: exoa is the computer user name.

C:\ Documents and Settings \ exoa \ My Documents \ My Music \iTunes\iTunes Media

Your path is:

C:\ Documents and Settings \ Computer User Name \ My Documents \ My Music \ itunes \ itunes media.

⑤ Select the options needed for synchronization, and click the "Apply" button to synchronize.

There will be a prompt when synchronizing: the prompt to erase synchronization. After the synchronization is completed, the purpose of deleting music is achieved.