  The prediction of properties of the low energy portion of the hadronic
spectrum is a challenging task which, up to day, is still tentatively given due
to the non-perturbative nature of QCD at low energies. In this paper we are
exploring the validity of the SO(4) scheme, as representative of the
fundamental QCD structure of meson-like states in the region below 2.5 GeV. We
have focussed the attention in the calculation of the energy and width of
states of various spin, isospin and parities. The theoretical results are
compared, sistematically, to the available experimental information.
