Apple is currently working with industries big four recording company, which will give iTunes user to download unlimited music that where purchased with users iTunes account. This move is taken by Apple to bring re-download option i.e.by providing a permanent link for the purchased songs from iTunes. So, if by chance user has deleted the songs or just need to install iTunes, then to do this; user need to just log in, and download all the content that where purchased earlier.
The permanent link option also provides a convenient way to download songs to iPhone and iPad without synchronizing via iTunes on user’s personal computer. So, when Apple will finally rolls out this service then it is going to benefit lots of Apple’s iTunes user.