  For a tensor product of algebras twisted by a bicharacter, we completely
describe its Hochschild cohomology, as a Gerstenhaber algebra, in terms of the
Hochschild cohomology of its component parts. This description generalizes a
result of Bergh and Oppermann. It allows us to significantly simplify various
calculations in the literature, and to compute Hochschild cohomology for a
number of new examples.
