  In this talk, we discuss a number of recent calculations aimed at determining
the spectral functions corresponding to various components of the energy
momentum tensor in high-temperature SU(N) Yang-Mills theory. The computations
reviewed include applications of both weak coupling and gauge/gravity
techniques, and thus enable one to access different limits of the quantities.
The motivation for the work is twofold: On one hand, the results are hoped to
aid the eventual nonperturbative extraction of the bulk and shear viscosities
from lattice data, while on the other hand they also enable an immediate
comparison of the lattice, perturbative and holographic predictions for certain
Euclidean correlators.
