The centerpiece of this invention is clusters. Clusters include taste signatures, which represent the tastes of a cluster. Users are enabled to find clusters that match their tastes, and artists are enabled to find the clusters where the users are who are likely be interested in their work. Clusters thus serve as hubs of activity for particular tastes; in most embodiments ratings of items of interest to those tastes can be viewed, and various embodiments may include various means for inter-user communication so that communities of people with similar tastes are formed.