  Hadron production in leading order pQCD is reviewed. The shape of the single
inclusive particle spectra is well described for $p_T \geq 2-3$ GeV at center
of mass energies from 20 GeV to 2 TeV. The phenomenological K-factor is found
to decrease systematically with $\sqrt{s}$. For ultra-relativistic heavy ion
reactions the calculation is augmented with the effects of initial multiple
parton scattering and final state radiative energy loss. Baseline CERN-LHC
predictions for hadron production in $p+p$ and suppression in central $Pb+Pb$
reactions at $\sqrt{s} = 5.5$ TeV are given in comparison to the corresponding
results at BNL-RHIC and CERN-SPS energies.
