  We consider thermal phases of holographic lattices at finite chemical
potential in which a continuous internal bulk symmetry can be spontaneously
broken. In the normal phase, translational symmetry is explicitly broken by the
lattice and the only conserved quantities are related to time translations and
the electric charge. The long wavelength excitations of the corresponding
charge densities are described by incoherent hydrodynamics yielding two
perturbative modes which are diffusive. In the broken phase an additional
hydrodynamic degree of freedom couples to the local chemical potential and
temperature and we write an effective theory describing the coupled system at
leading order in a derivative expansion.
