Can't figure out how to get the artist name from a DiscID

Hi,

I have spent countless hours trying to get the Artist name from a 
DiscID.  The CRelease has a CArtist in it but it's always NULL, yet 
when I cout << *FullRelease in the sample code the Artist Name is there.

The documentation is not at all helpful.  ANY help would be greatly 
appreciated.

Thanks,
David