  We discuss Massey products in a N-graded Lie algebra cohomology. One of the
main examples is the positive part L_1 of the Witt algebra $W$. We consider an
associated graded algebra m_0 of L_1 with respect to the descending central
series and prove that H*(m_0) is generated with respect to non-trivial Massey
products by one cohomology H^1(m_0).
