Labbler is a relatively new music industry social network that is now in public beta. It plans to connects "Artists, Labels, Booking Agencies, Venues, Media and Fans as well as providing tools for all business needs of these groups." But though the sites looks nice and these groups of people all do need to connect in various ways, it's unclear why they would use Labbler to do so.
As a music industry network the biggest problem facing Labbler is that artists and business people are already networking through a variety of services including LinkedIn and Twitter. But music industry specific networks have failed to break through and no one has been able to become the LinkedIn or Twitter of the music industry.
That means the challenge of giving people a reason to use Labbler looms much larger than effective design and operation of such a website.