  We study the multigraded Poincar\'e-Betti series of $A=S/\aaf$, where $S$ is
the ring of polynomials in $n$ indeterminates divided by the monomial ideal
$\aaf$. There is a conjecture about the multigraded Poincar\'e-Betti series by
Charalambous and Reeves which they proved in the case, where the Taylor
resolution is minimal. We introduce a conjecture about the minimal $A$-free
resolution of the residue class field and show that this conjecture implies the
conjecture of Charalambous and Reeves. We prove our conjecture for several
classes of algebras. The conjecture implies that $A$ is Golod if and only if
the product (i.e. the first Massey operation) on the Koszul homology is
trivial. Under the assumption of the conjecture we finally prove that a very
simple purely combinatorial condition on the minimal monomial generating system
of $\aaf$ implies Golodness for $A$.
