On May 5, 1955, WWII allies France, Great Britain and the U.S. officially end their occupation of West Germany. The defeated nation was split by the terms of its surrender, with the Soviet Union controlling East Germany. As the Cold War took hold and it became apparent a re-unification of the nation would never happen, the Allies began taking steps toward an independent West Germany, allowing it to form the Federal Republic of Germany in 1949, and granting it admission into NATO in 1954. It was also allowed to establish a military and build arms, though it was forbidden chemical and nuclear weapons. The Soviets formally recognized West Germany independence a short time later. On May 5, 1877, Chief Sitting Bull leads a small band of Lakota Indians into Canada to avoid harassment by the U.S. Cavalry. The Lakota and other tribes that had been involved in the June 1876 Battle of the Little Bighorn had broken into smaller groups, hoping to avoid capture by the cavalry and relocation to reservations. Many were caught anyway, but Sitting Bull (having met once with Cavalry officers and rejecting an offer to resettle peacefully) sought refuge in Canada, where the government was more tolerant of natives than was the U.S. Many of his followers tired of life in Canada and returned to the U.S. over the next few years, and Sitting Bull did as well, in 1881. On May 5, 1891, the New York Hall of Music officially opens with a concert by the New York Symphony, with guest conductor Pyotr Tchaikovsky. In 1895 it will be renamed Carnegie Hall for its principal financier, industrialist Andrew Carnegie. With theatres consisting of the 2,800 seat Isaac Stern Auditorium (below), two smaller theatres, 24 practice halls and an archive, Carnegie Hall is among the world's most prestigious venues for both classical and popular music. It is a National Historic and New York City Preservation Landmark. Legend has it a pedestrian walking down NYC's 57th Street once asked violinist Jascha Heifetz, "How do I get to Carnegie Hall?" Heifetz (or sometimes its credited to Dizzy Guillespie, Jack Benny, Arthur Rubenstein, or any one of a number of other performing notables) replied, "Practice!"