  A detailed study of orbital and radial excited states in D, Ds, B and B_s
systems is performed. The chiral quark model provides the framework for the
calculation of pseudoscalar meson (pi, K, ...) hadronic transitions among
heavy-light excited and ground states. To calculate the excited states masses
and wavefunctions, we must resort to a relativistic quark model. Our model
includes the leading order corrections in 1/m_(c,b) (e.g. mixing). Numerical
results for masses and light hadronic transition rates are compared to existing
experimental data. The effective coupling of the chiral quark model can be
determined by comparing with independent results from lattice simulations
(g^8_A = 0.53 +-/- 0.11) or fitting to known widths (g^8_A = 0.82 +-/- 0.09).
