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http://m.phys.org/news/2016-01-musical-melodies-laws-foraging-animals.html
Gunnar A. Niklasson and Maria H. Niklasson. Non-Gaussian distributions of melodic intervals in music: The Lévy-stable approximation. EPLA, 2015, EPL (Europhysics Letters), Volume 112, Number 4. dx.doi.org/10.1209/0295-5075/112/40003
http://iopscience.iop.org/article/10.1209/0295-5075/112/40003