A new version of our manuscript, "A random matrix definition of the boson peak", is now available on the arXiv: http://arxiv.org/abs/1307.5904.  This new version highlights the connections between our work and Euclidean Random Matrices.  It also shows that our proposed universality class does not fall into the broad class of "Gaussian Wigner" matrices, which also have a surprsing universality, that have recently been studied by mathematicians like Terry Tao.