  Recent progress in understanding the strong physics regime of QCD is
described. The role played by condensates, particularly $q{\bar q}$, in
breaking chiral symmetry and generating constituent masses for $u$ and $d$
quarks is reviewed. The influence this has on hadrons with vacuum quantum
numbers is emphasised. What we know of this sector from recent data on
$\phi$-radiative decays and from $D$ decays to light hadrons is discussed. The
key to further understanding is comprehensive analyses of such data, including
that planned for Hall D at Jefferson Laboratory.
