An ansatz that predicts the frequency dependence of viscoelastic moduli of polymer solutions was tested against literature data on linear polymers and polymer microgels. Excellent agreement was uniformly found between the ansatz and the experiment. The ansatz does not give a simple reduction scheme or a master plot; it systematizes large amounts of data to a few parameters. The dependence of these parameters on polymer concentration and solvent quality was examined. The ansatz satisfies Kronig-Kramer's relations; transformations of G'(omega) and G"(omega) for a given system lead to the same G(t).