I usually call her Vanessa because there's only one other Vanessa any of us know and it's our neighbor's daughter, but they have nothing in common so in any one sentence it's easy to tell which Vanessa we're talking about by the context.
I've always just had a thing against shortening someone's given name, even if that's how their closest friends call them unless I'm around the person seven hours a day, five days a week, and then I start to shorten anything. My own fiancée I'll even call by her three-syllable name instead of just by the first one as her brother and friends call her. She has too beautiful a name to shorten, IMHO (Both my fiancée and Vanessa).
As for her music, I call that Nessahol! :wink: