I would like to ask a question about the so-called ''Master Field''. As far as I understand, this represents a classical configuration in the large n limit (saddle point solution) but there is no systematic way to derive master fields for gauge theories. Is anybody trying to solve this problem anymore? Has the Ads/CFT correspondence partially solved it or hinted towards the right direction by considering the gravity dual of the gauge theory as the ''Master Field''? If you know any relevant review papers please post!