[mattmcknight]

"The hip-hop and minimal house classification perform almost randomly (the random classifier would have accuracy of 50%). " You are assuming that this is a series of binary classifiers. It is multiclass classification, so the base rate for nine classes is 11%.

[1r3n1cus]

If the classes are balanced, that is. Without knowing the distribution of the classes it is difficult to understand if the result is good or not.

[redsparrow]

The author downloaded 1000 tracks from each class, so they are evenly distributed.

[oscii]

Oh yes, you're right. Thanks for the correction! A recent peer review is still in my head.