Wagner Der Ring des Nibelungen opera cycle performed 2010-2013 at the Teatro alla Scala with Guy Cassiers as stage director and Barenboim conducting. The box includes the four titles described in more detail on this site:
We have not reviewed any of the operas in this Ring. Our goal would be to review them all separately. The main purpose of this report would be to alert you to the opporturnity to save by buying the cycle in this box.