  In this talk, based on [1,2], I argue that the holographic Schr\"odinger
Equation of $(3+1)$-dim, conformal light-front QCD and the 't Hooft Equation of
$(1+1)$-dim, large $N_c$ QCD, can be complementary to each other in providing a
first approximation to hadron spectroscopy. Together, the two equations play a
role in hadronic physics analogous that of the ordinary Schr\"odinger Equation
in atomic physics.
