  We employ hydrodynamics and gauge/gravity to study magneto-transport in
phases of matter where translations are broken (pseudo-)spontaneously. First we
provide a hydrodynamic description of systems where translations are broken
homogeneously at nonzero lattice pressure and magnetic field. This allows us to
determine analytic expressions for all the relevant transport coefficients.
Next we construct holographic models of those phases and determine all the DC
conductivities in terms of the dual black hole geometry. Combining the
hydrodynamic and holographic descriptions we obtain analytic expression for the
AC thermo-electric correlators. These are fixed in terms of the black hole
geometry and a pinning frequency we determine numerically. We find an excellent
agreement between our hydrodynamic and holographic descriptions and show that
the holographic models are good avatars for the study of magneto-phonons.
