The Personal Audio system developed in 1996 included a server system that made available a library of information and entertainment programming to individual subscribers. The server selectively delivered programs to a given subscriber based on that subscriber’s characteristics, subject matter preferences and interests, express requests, and the subscribers recorded listening choices. Data describing an individual subscriber’s general interests, characteristics and preferences were combined with popularity data from other users and matched against the characteristics of each stored audio program to identify those having significant potential appeal to that subscriber, allowing the Personal Audio server to compile a personalized catalog for each subscriber which listed recommended programs of likely interest to that subscriber. Techniques like those used in the Personal Audio system have since been adopted by most online music providers, making it easier for users to find music they like. The 1996 system for providing personalized, episodic content is described and claimed in Personal Audio’s U.S. Patent No. 5,721,827 entitled "System for Electrically Distributing Personalized Information".