  We discuss the origin of chiral symmetry breaking in the light-cone
representation of QCD. In particular, we show how quark helicity symmetry is
spontaneously broken in SU(N) gauge theory with massless quarks if that theory
has a condensate of fermion lightcone zero modes. The symmetry breaking appears
as induced interactions in an effective lightcone Hamiltonian equation based on
a trivial vacuum. The induced interaction is crucial for generating a splitting
between pseudoscalar and vector meson masses, which we illustrate with spectrum
calculations in some 1+1-dimensional reduced models of gauge theory.
