I am a huge fan of Marc Blitzstein's Threepenny Opera adaptation, buty I never knew what text played forseven yewars or so at the Theatre de Lys in the Village because the rental libretto of Blitzstein's version had to be revised to accommodate the score. Here's why.
In the 1954 production with Lotte Lenya, Jo Sullivan, Bea Arthur, etc., "Pirate Jenny," which Brecht and Weill gave to Polly in Act One Scene Two, was given to Lotte Lenya in the brothel scene. So, when Polly told the wedding guests she would sing a little song, she sang somethiung called "The Bide-a-wee in Soho," which was Blitzstein's adaptation of "The Bilbao song" from the Weill-Brecht Happy End. It could not be included in the rental because it's an interpolation from another show.
I found on eBay a copy of the libretto of the actual production script with the Bide-a-wee song included. I am very happy. Another musical theatre question solved!