Made-to-Order (Archive Copy) from the back catalogue of IMP (Warner Brothers) - MUSIC VAULT.
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Blitz! opened in London on the 8th May 1962 at the Adelphi Theatre, while Bart's enormous West End success Oliver! was still running at the New Theatre. (At that time Oliver! had not yet been produced on Broadway).
Blitz! ran for 568 performances. It never ran on Broadway: between its scale and the fact that New Yorkers could hardly be expected to share Londoners' nostalgia for the period, it proved "unexportable".
Bart wrote the music and lyrics, and had directed the original London production himself. Joan Maitland contributed to the libretto.