A viscoelastic composition, a panel constrained layer damper containing a viscoelastic layer and a constraining layer, and a damped structure all provided. The viscoelastic composition features an elastomeric polymeric component containing an ethylene vinyl acetate having a vinyl acetate content constituting about 60 weight percent or more of the ethylene vinyl acetate, a thermoplastic polymeric component such as an ethylene vinyl acetate with a vinyl acetate content constituting about 40 weight percent or less of the ethylene vinyl acetate, asphalt, filler, and a blowing agent.