Let G be a real simple Lie
group of classical type having a compact Cartan subgroup. Then G has discrete series
representations. The purpose of this paper is to establish explicit formulas for certain
sums of discrete series characters. These “averaged” discrete series characters
have simple formulas which can be used for certain problems in harmonic
analysis on G, for example, for the computation of the Plancherel measure on
Ĝ.