说明：  提取音乐（wav格式）中两种和弦特征：chromagram和tonalcentroid。其中chromagram是12维特征，根据十二平均律而来；tonalcentroid是在十二平均律的基础上加入了和弦结构信息（五度循环圈）得到的六维信息。
(Extraction of music (wav format) in the characteristics of the two chords: chromagram and tonalcentroid. Chromagram which is 12-dimensional features, according to十二平均律come tonalcentroid is the basis of十二平均律joined the chord structure of information (five degrees circle) received the six-dimensional information.)