That is to say, some music videos, for example, other people's cover songs you downloaded from YouTube may fail to be loaded to iPod touch using iTunes because your Apple ID that has been signed in will detect the songs automatically.

On the other side, the content purchased from third-party music apps is an exception for iTunes to sync, although it can sync non-iTunes music from PC to iPod iPhone iPad. The worst part is the music you purchased disappears along with it and can never get back. You may get your music files or entire music library lost without notice.

On one side, when putting songs on iPod or iPod touch with iTunes, all the previous media files synced from computer or iTunes library (like, songs, playlists, iBooks, photos, etc.) have great chance to be erased. However, iTunes music syncing feature has been frequently complained by Windows users: It is also an all-in-one app that allows you to download, purchase music play music directly on PC and manage the songs downloaded from iTunes Store, which will recommend you various music, songs and albums according to your preferences and let you know newest music information and ranking list. Many iOS users transfer iPod to PC using iTunes as it is the default Apple tool to sync media files. IPod to PC Transfer: Sync Music from iPod to Computer with iTunes