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1)During the Second World War, the Proms continue to be organised until the Queen's Hall was destroyed by a bomb in 1941
2)From the 1950s, the number of guest orchestras at the conserts began ro grow

1) During the Second World War, the Proms continued to be organised until the Queen's Hall was destroyed by a bomb in 1941. 2) From the 1950s, the number of guest orchestras at the conserts began to grow.