Autograph signature from the American pianist known for his piano trio performances with Isaac Stern and Leonard Rose, and for his mastery of German repertory. On a page from an August 8, 1958 program of the Boston Symphony at the Tanglewood Shed, Istomin has signed above his name. He performed Beethoven's "Emperor" concerto with the BSO, under Charles Munch. Left edge rough; otherwise fine. 7.5 x 10.25 inches (18.8 x 26.2 cm).