The first Festival concentrated mainly on classical music, a highlight being concerts given by the Vienna Philharmonic, reunited with their erstwhile conductor Bruno Walter, who had left Europe after the Nazi occupation of his homeland. The Festival's first dramatic success came in the following year when an adaptation of Sir David Lyndsay's "The Thrie Estaites" was performed to great acclaim for the first time since 1552 in the Assembly Hall on the Mound. The British Army's desire to showcase itself during the Festival period led to the independent staging of the first Edinburgh Military Tattoo, featuring displays of piping and dancing, in 1950. This annual event has come to be regarded as an integral part of the official festival, though it continues to be organised separately.