Yuxiang Liu Ye Wang Arun Shenoy Wei-Ho Tsai Lianhong Cai Clustering Music Recordings by Their Keys. 319-324 2008 ISMIR http://ismir2008.ismir.net/papers/ISMIR2008_161.pdf conf/ismir/2008 db/conf/ismir/ismir2008.html#LiuWSTC08