Michael Kai Petersen Lars Kai Hansen Andrius Butkus Semantic Contours in Tracks Based on Emotional Tags. 45-66 2008 CMMR http://dx.doi.org/10.1007/978-3-642-02518-1_3 conf/cmmr/2008 db/conf/cmmr/cmmr2008.html#PetersenHB08