In one of the previous articles I gave you five different working methods of downloading music to iPhone. In that article I didn’t mentioned any possible problems which may occur while adding music to iPhone via iTunes. Today we’ll cover the reason why you might get a message “Syncing iPhone with this iTunes library will replace media from another iTunes library on Computer. An iPhone can only sync with one iTunes library at a time.” and what all that means. At the end I will provide 2 alternative ways of adding music to iPhone so the message above doesn’t bother you any more.