Help me display Music Videos

Hi,

I'm using theconcertdb.org to scrap my concerts, and manually edit .nfo files when scrapper fails.
If I enter "Music Videos -> Titles", everything is good, but I want to group concerts by artist folder;
So I tried "Music Videos -> Artists", and i can see all my artists. But when I click on one of them, I have an empty list!

Is this a confluence or xbmc bug ?
Maybe a workaround is to set my concerts as Movies, use smarplaylist to separate them from real movies, and add a <set>Artist Name</set> tag in the .nfo to group?

Thanks