  We exploit the recently proposed correspondence between gravitational
perturbations and quantum Seiberg-Witten curves to compute the spectrum of
quasi-normal modes of asymptotically flat Kerr Newman black holes and establish
detailed gauge/gravity dictionaries for a large class of black holes, D-branes
and fuzzballs in diverse dimensions. QNM frequencies obtained from the quantum
periods of $SU(2)$ ${\cal N}=2$ SYM with $N_f=3$ flavours are compared against
numerical results, WKB (eikonal) approximation and geodetic motion showing
remarkable agreement. Starting from the master example relating quasi-normal
modes of Kerr-Newman black holes in AdS$_4$ to $SU(2)$ gauge theory with
$N_f=4$, we illustrate the procedure for some simple toy-models that allow
analytic solutions. We also argue that the AGT version of the gauge/gravity
correspondence may give precious hints as to the physical/geometric origin of
the quasi-normal modes/Seiberg-Witten connection and further elucidate
interesting properties (such as tidal Love numbers and grey-body factors) that
can help discriminating black holes from fuzzballs.
