https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7100934 A summery for audio scene classification https://www.iis.sinica.edu.tw/papers/whm/12400-F.pdf Bag of word approach for audio music classification https://github.com/danstowell/smacpy smacpy - simple-minded audio classifier in python https://link.springer.com/content/pdf/10.3758%2Fs13428-012-0299-5.pdf Recurrent Quntification Analysis