Help with the cabaret music during the good times

Yes! It's been answered elsewhere: it's Die Moritat von Mackie Messer, by Kurt Weill, or as it's known in English, Mack the Knife. It's been done loads of times, by everyone from Louis Armstrong to Bobby Darin, to Sting.

However, this version of the song--which I thought was very lovely too--took me ages to find--but I found it just now!

It's Die Dreigroschenoper (The Threepenny Opera), opera No. 2. Die Moritat von Mackie Messer, by the Berlin State Opera Orchestra, conducted by Otto Klemperer.

You can find it here:
(1) http://www.amazon.com/Weill-Die-Dreigroschenoper-Threepenny-Opera/dp/B000001WNQ/ref=sr_1_2?ie=UTF8&s=music&qid=1233416339&sr=1-2

It's track 12.

OR

(2) http://www.amazon.com/The-Collectors-Threepenny-Opera/dp/B000053W80/ref=sr_1_1?ie=UTF8&s=music&qid=1233416339&sr=1-1

Track 18.

It's a great, dark, haunting song, and it's a part of a wider social critique of government and capitalist society during 1920s Germany. The English versions have been heavily sanitised, but the original--German--tracks have kept the cruelty implicit in the track.

An appropriate song in the run-up to the darkest chapter in European history.