  I consider a model for heavy meson decays based on an effective quark-meson
Lagrangian. The model is constrained by the known symmetries of QCD in the m_Q
-> infinity limit for the heavy quarks, and chiral symmetry in the light quark
sector. Using a limited number of free parameters it is possible to compute
several phenomenological quantities, e.g. the leptonic B and B** decay
constants; the Isgur-Wise form factors: xi, tau(3/2), tau (1/2), describing the
semi-leptonic decays B -> D(*) l nu, B -> D** l nu; the form factors for heavy
to light decays B -> rho l nu, B -> a_1 l nu. I show that the semileptonic
heavy-to-light form factors calculated in the model fulfill the general
relations that hold in QCD in the large energy limit for the final hadron.
