Similar to the concept of reading groups, listening groups are private or public groups of members, under a given name.
The groups have _shared_ lists, and something have to be voted by (all or some) members of the group in order to be added to a list.
As the network grows, this may facilitate organically emerging groups of people with similar music tastes and will provide a more tailored discovery experience (since there may be niche groups focused on certain genres).