I think the major problem with services like this is that they have things at the far ends of the popularity bell curve fall off. Jcore being one of them. Kind of a chicken and the egg problem where people who like any of a number of niche generas come to the site, find it useless to them, and don't contribute. perhaps some incentive for adding new artists could break this cycle? or even just a link in the "Not Found" page tot he contribution suggesting if they like that band to leave their favorites for others.