Sharing Files/Music/Conctact Between Users on Same Computer

Good Day,
I tried to search, but was unable to locate the answers to my questions.

1. I have two users set up on my macbook, myself and my wife. I have all the contacts under my name, and she has music under her name. The music was loaded via a CD and not itunes. How do i log onto her username and see the contacts or port them over to her user name? How do i move music from her itunes library to mine? I shouldn't have to take up more hard drive space by reloading the CD's under my username, should I?

Thanks in advance.