Despite the loss of Copes, the remaining three members of the quartet‹violinist Joel Smirnoff, cellist Joel Krosnick, and violist Samuel Rhodes‹performed at San Francisco's Herbst Theatre on the evening of January 25, replacing some of the works on the program with solo works for oboe, performed by guest artist Heinz Hollinger. Hollinger also joined the three string players to perform the Mozart Quartet for Oboe and Strings as scheduled.