  A constituent parton picture of hadrons with logarithmic confinement
naturally arises in weak coupling light-front QCD. Confinement provides a mass
gap that allows the constituent picture to emerge. The effective renormalized
Hamiltonian is computed to ${\cal O}(g^2)$, and used to study charmonium and
bottomonium. Radial and angular excitations can be used to fix the coupling
$\alpha$, the quark mass $M$, and the cutoff $\Lambda$. The resultant hyperfine
structure is very close to experiment.
