We determine the effects of correlations on high-frequency plasma wave
s by using both the high-frequency sum-rules (HFSR-s) and the STLS (Si
ngwi, Tosi, Land and Sjolander). approximation schemes for undamped cl
assical one-component plasmas. We find that correlational energy contr
ibution not accounted for by the STLS is approximation -2/15 beta(p)E
corr.