There are two ways to backup and transfer your iPhone music tracks to Windows 8.
A. By performing a Smart backup of your iPhone to Windows 8 via CopyTrans. This will compare the contents of your iTunes library on your Windows 8 computer with the contents of your iPhone. Your iPhone songs, videos, playlists, and apps will then be automatically transferred to your iTunes library without creating duplicates.
B. By performing a Manual backup of your iPhone to Windows 8 via CopyTrans. This allows you to transfer your iPhone music, videos, playlists, and apps to a selected folder on your new Windows 8 PC. The Manual CopyTrans backup also allows you to transfer tracks, playlists, and apps of your choice from your iPhone to your new PC’s iTunes library.