  We introduce Riemannian metrics of positive scalar curvature on manifolds
with Baas-Sullivan singularities, prove a corresponding homology invariance
principle and discuss admissible products. Using this theory we construct
positive scalar curvature metrics on closed smooth manifolds of dimension at
least five which have odd order abelian fundamental groups, are nonspin and
atoral. This solves the Gromov-Lawson-Rosenberg conjecture for a new class of
manifolds with finite fundamental groups.
