Bulgaria–United States relations to work. Bulgaria became a member of the Warsaw Pact on May 14, 1955. Though no Soviet troops were stationed on Bulgarian soil, in 1968, Zhivkov sent a Bulgarian division to join Polish, Hungarian and Soviet troops to crush a popular uprising in Prague. In 1978, the Bulgarian secret police were implicated in the assassination in London of Georgi Markov, a Bulgarian dissident who was a correspondent for the BBC World Service, Deutsche Welle radio and the U.S. sponsored Radio Free Europe. Markov was assassinated with a poisoned umbrella on September 7, Zhivkov's birthday. The rise of democratic movements across
A Boy Was Born set of variations for string orchestra which he was later to complete as the "Variations on a Theme of Frank Bridge". Later he was to compose a set of variations for his Piano Concerto, and his opera "The Turn of the Screw" is extensively based on the variation principle. "A Boy Was Born" was first performed on 23 February 1934 in a BBC radio concert of contemporary music. Leslie Woodgate conducted the Wireless Chorus and choirboys of St Mark's, North Audley Street, London. Sir Edward Elgar died the same day. The work takes about 32 minutes to perform. It was