Leif Ove Andsnes, Piano, James Ehnes, Violin, Tabea Zimmermann, Viola, and Clemens Hagen, Cello The Annual Isaac Stern Memorial Concert All-Brahms Program Due to the imminent early arrival of his child, Christian Tetzlaff withdrew from his US performances this week. He was replaced on this performance by James Ehnes. chamber music performance 2016-04-09T19:00:00