I have a separate Itunes account from my husband, why is his music appearing on my account?

Hi,

The problem is that my husbands music is showing up on my seprate account. We have home sharing disabled. When I go into prefrences, it has his name under item prefrence folder. This computer is new, and he has never used it for Itunes. Please help, as this is sooo frustrating.

Thank you so much!