  We explore the large-N limits of 2d CFTs, focusing mostly on WZW models and
their cosets. The $SU(N)_k$ theory is parametrized in this limit by a 't
Hooft-like coupling. We show a duality between strong coupling, where the
theory is described by almost free fermions, and weak coupling where the theory
is described by bosonic fields by an analysis of spectra and correlators. The
AdS$_3$ dual is described, and several quantitative checks are performed.
Besides the more standard states that should correspond to bulk black holes we
find ground states with large degeneracy that can dominate the standard Cardy
entropy at weak coupling and are expected to correspond to regular horizonless
semiclassical bulk solutions.
