A friend of mine just gave me, obtained from the Marais and Miranda web site, a reproduction (I assume it's a reproduction) of a full-page ad for the duo from the February, 1953, issue of "Musical America."
The ad reproduces a Feb. 2, 1953 New York Times review of Marais & Miranda's sold-out concert at Town Hall. It concludes thusly:
    "The size of the audience is perhaps worth special comment. At many a recital following conventional lines the house has been more than half empty. Yet in the last few weeks, Richard Dyer-Bennett, Andres Segovia and Marais and his wife have packed the hall. It is surely an indication of a strong interest on the part of listeners in guitar playing and in songs sung gently in the language the audience understands."
The review is signed only with the initials: R.P. Whoever he or she was, R.P. was onto something.