  We show that for almost every frequency alpha \in \R \setminus \Q, for every
C^omega potential v:\R/\Z \to R, and for almost every energy E the
corresponding quasiperiodic Schrodinger cocycle is either reducible or
nonuniformly hyperbolic. This result gives very good control on the absolutely
continuous part of the spectrum of the corresponding quasiperiodic Schrodinger
operator, and allows us to complete the proof of the Aubry-Andre conjecture on
the measure of the spectrum of the Almost Mathieu Operator.
