<a href="https://en.wikipedia.org/wiki/Bartlett_and_Robertson" class="extiw" title="en:Bartlett and Robertson">Bartlett and Robertson</a> were a husband-and-wife classical piano duo who were credited with popularizing two-piano music in Europe and the United States in the 1930s and 1940s through their extensive touring, recordings, and radio performances.  Guess at 1945 as date of sig.
<a href="https://en.wikipedia.org/wiki/Bartlett_and_Robertson" class="extiw" title="en:Bartlett and Robertson">Bartlett and Robertson</a>
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