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Recent pT<2~GeV azimuthal correlation data from the Beam Energy Scan (BES)and D+Au runs at RHIC/BNL and, especially, the surprising similarity ofazimuthal $v_n\{2m\}(p_T)$ ``transeverse flow'' harmonics in $p+Pb$ and $Pb+Pb$at LHC have challenged the uniqueness of local equilibrium ``perfect fluid''interpretations of those data. We report results at QM14 on azimuthal harmonicsassociated with initial-state non-abelian ``wave interference'' effectspredicted by perturbative QCD gluon bremsstrahlung and sourced by ColorScintillation Arrays (CSA) of color antennas. CSA are naturally identified withmultiple projectile and target beam jets produced in inelastic p+A reactions.We find a remarkable similarity between azimuthal harmonics sourced by initialstate CSA and those predicted with final state perfect fluid models of highenergy p+A reactions. The question of which mechanism dominates in $p+A$ and$A+A$ remains open at this time.

Initial-State Bremsstrahlung versus Final-State Hydrodynamic Sources of Azimuthal Harmonics in p+A at RHIC and LHC