iTunes question can't find answer

so I'm trying to figure something out. heres the set up:
MBP, 2 accounts, me and my wife
Itunes, we each have an iTunes account as we both have iPhones (i have and iPad as well)

what i would like to do is be able to share my music/apps/books/videos between both the user accounts and iTunes accounts.
i want to be able to open iTunes, have all my stuff and be logged into my iTunes account.
then i want my my wife to be able to get all the same music apps etc while logged into her user/tunes account.
but to finish it off, I'm trying to get it so, if i add music etc, she sees it when she logs in and vice versa.

i have seen some ways but nothing seems to be what I'm looking for. once i get that, then i have to see how to sync that to the mac pro.

thanks for any help in advance