"Here's a preliminary data mining analysis of musical social networking service Last.fm. An automated classification into clusters or sub populations with related musical genres reveals the structure of musical preferences among the users in a relatively large sample population. Musical tag clouds are adopted to characterise users and populations, which adds a highly descriptive value and aids with the interpretation of the results."
R. Jäschke, A. Hotho, C. Schmitz, and G. Stumme. Proceedings of the 15th International Conference on Conceptual Structures, Sheffield, England, (July 2007)
A. Troy, G. Zhang, and Y. Tian. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 206--219. Berlin, Heidelberg, Springer-Verlag, (2007)
T. Hofmann. volume 2003 of Special issue of the SIGIR forum, New York, NY, International Conference on Research and Development in Information Retrieval, ACM Press, (2003)