Sharing files between accounts...who owns this folder?

So when setting up a folder to share such as an iTunes library or iPhoto etc...should the owner be "system" or a particular user?

i tried owning it and setting group to everyone but the other user accounts kept getting disk is locked or you don't have permissions.

i put the original folder in the shared folder and set owner to system. then i created aliases in each user account and renamed folder to match original...changed original. now each alias points to the shared folder.

seems like a lot to go through...Is there an easy process?