How add new songs to your iPod/iPhone using another iTunes w/out erasing old 1s on it

Here come loads of chances for you to use a new computer or something like reformatted hard disk. For an iPod/iPhone user, it’s not so convenient though. You need to move your iTunes library to the new computer or recover the iTunes library on the reformatted hard disk if you want to add new songs to your iPod/iPhone. Here we’ll talk about how to add new songs onto an iPod/iPhone on a new /reformatted computer while keeping all songs on your Pod.
Step 1: Download and install iTunes on the new/reformatted computer

Step 2: Open iTunes and add new songs to iTunes

Step 3: Plug your iPod/iPhone and turn off the auto sync in case that automatically synchronization will erase the content on iPod
How to turn off the auto sync:
(1), Launch iTunes
(2),go to the menu “edit”–> "preferences” on iTunes menu
(3),go to "devices” and select "disable auto sync for iPhone and iPod” and then go to "ok"

Step 4:Download and install Aniosoft iBackup
(http://www.aniosoft.com/aniosoft-ipo…-transfer.html) and it will detect songs on your iPod/iPhone automatically

Step 5: Transfer all the content from iPod/iPhone to iTunes with Aniosoft iBackup and then iPod’s original songs are together with new songs on the newly installed iTunes

Step 6: Sync your iPod/iPhone to iTunes where both new songs and iPod/iPhone’s songs are currently included