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The generic band structure of high-T$_C$ copper oxides is simulated by thenearly free-electron model (NFE) in two dimensions (2-D) with parameters fromband calculations. Interaction between phonons and spin waves will causepotential modulations and pseudogaps, and the strength of the modulations, thewave lengths and the doping, are all related. A Fermi-surface "arc" is foundfor dynamic spin/phonon waves. The confinement of superconductivity between twolimiting dopings can be a result of competition with the pseudogap at lowdoping and weak coupling at high doping.

Properties of high-T$_C$ copper oxides from the nearly-free electron model