Signal Processing Magazine. vol. 49 (8), pp. 49-52, 2006 D. Little, D. Raffensperger, B. Pardo. A Query by Humming System that Learns from Experience. Proceedings of the 8th International Conference on Music Information Retrieval, Vienna, Austria, September 23-27, 2007. D. Little, D. Raffensperger and B. Pardo.Online Training of a Music Search Engine. Northwestern University, Evanston, IL, NWU-EECS-07-03, 2007 External links Tunebot @ Northwestern Music search engines Acoustic fingerprinting