1. I wonder how the continuous wavelet transform would compare to the windowed Fourier transform used here. See [1] an python implementation, for example.

2. The size of frequency analysis blocks seems arbitrary. I wonder if there is a "natural" block size based on a song's tempo, say 1 bar. This would of course require a priori tempo knowledge or a run-time estimate.

[1]: https://docs.scipy.org/doc/scipy-0.15.1/reference/generated/...