Music has mass, maybe

In classical physics sound is a perturbation spreading in a material, but a new theory is challenging this assumption. Two Italian physicists, Alberto Nicolis and Nicola Penco, from Columbia University, are trying to demonstrate that sound has a mass. To verify this theory the scientists might be forced to measure the waves generated by earthquakes, that produce a particularly high mass. Discovering that sound and music have a mass would be a real cultural revolution in physics, but at the moments practical applications are not clear.