  In this contribution, we briefly discuss the results for charmonium and
bottomonium spectra with self-energy corrections in the unquenched quark model,
due to the coupling to the meson-meson continuum. The UQM formalism can be
extended to include also the effects of hybrid mesons, i.e. hybrid loops.
Finally, we discuss the results of a calculation of hybrid mesons spectrum in
Coulomb Gauge QCD.
