Bartlett and Robertson
... that the husband-and-wife piano duo of Bartlett and Robertson were said to play like "four hands at a double keyboard controlled by a single mind"?
... that the husband-and-wife <a href="./List_of_classical_piano_duos_(performers)" id="mwBYk" rel="mw:WikiLink" title="List of classical piano duos (performers)">piano duo</a> of <b id="mwBYo"><a href="./Bartlett_and_Robertson" id="mwBYs" rel="mw:WikiLink" title="Bartlett and Robertson">Bartlett and Robertson</a></b> were said to play like "four hands at a double keyboard controlled by a single mind"?<!--Special occasion request for February 14-->