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It is a form at least as old as the 15th-century composer Gilles de Bins Binchois, and the English musicologist David Fallows, in his Binchois entry in the 1980 New Grove Dictionary of Music and Musicians, spelled out the composer’s name using the first letter of each paragraph.

Such verbal subtleties are difficult to search out on YouTube, as are climactic moments in Binchois’s music.

After the Ligeti étude, Mr. Denk ended by repeating the second piece he had played, a wistful medieval song by Gilles Binchois, which made this story seem circular.

The guest director Robert Mealy leads performances of Guillaume Du Fay and Gilles Binchois, among others.

But even after the countertenor Martin Near had sung that love song, “De plus en plus” by Gilles Binchois, with sweet limpidity over an accompaniment of two medieval fiddles, I still had trouble picking out its melody once the full complement of singers began to sing Ockeghem’s Mass.