 After an attempt at a recording career, with three overlooked singles released on Decca Records in 1955, Brown moved into musical theatre; one of her early credits was Bernard Delfont's "Folies Bergeres" at the Prince of Wales Theatre.Her breakout role was playing Lucy in the 1956 West End revival of "The Threepenny Opera" at the Royal Court Theatre, a role she repeated the following year when she joined the cast of the highly successful off-Broadway production.Brown's career role was that of Nancy in the musical "Oliver!