Following the 2020 releases of Petula Clark’s Christmas in London and On Air: 1951-1961, the Stage Door label is continuing its series exploring the early days of the superstar’s extraordinary and still-thriving career.  On May 21, Stage Door will release In Copenhagen 1958-1960, premiering a disc’s worth of previously unreleased recordings from this largely unexplored period of Petula’s career. The nearly two dozen recordings here have been sourced from master tapes housed in the archives of the Danish Broadcasting Corporation and were recorded by Petula for use in four television specials recorded…