  We determine the black hole quasi-normal mode spectrum for tensor
perturbations in topologically massive AdS-gravity. In the special case of
chiral gravity quasi-normal modes are absent despite of the presence of a
horizon. In the process we uncover a simple algebraic structure in the quasi
normal modes spectrum: the tower of QNM's consists of descendents of a "chiral
highest weight'' QNM which in turn satisfies a first order equation.
