  For many years the Korringa-Kohn-Rostoker coherent-potential approximation
(KKR-CPA) has been widely used to describe the electronic structure of
disordered systems based upon a first-principles description of the crystal
potential. However, as a single-site theory the KKR-CPA is unable to account
for important environmental effects such as short-range order (SRO) in alloys
and spin fluctuations in magnets, amongst others. Using the recently devised
KKR-NLCPA (where NL stands for nonlocal), we show how to remedy this by
presenting explicit calculations for the effects of SRO on the electronic
structure of the bcc Cu_{50}Zn_{50} solid solution.
