One other anecdote from Tuesday's recital, before I forget: A cellphone went off in the audience just as Dawn Upshaw was preparing to sing "Ann Street." She handled it with good humor, saying it would work with the song. For my part, I was suddenly struck by how much the default iPhone ring tone resembles the the rhythmic pattern of "The Se'er."
Then, after intermission, Gilbert Kalish walked onstage carrying a slat of wood that is called for in the score of the Concord Sonata. (It's used to produce a number of high-pitched, delicate-sounding tone clusters in the "Hawthorne" movement.) Just before he began his remarks about the piece, he held the wood in front of him, at about belt level, and said, "This is for the people with their cellphones."