The show is based on a novel by Henry Fielding, who wrote Tom Jones, and has a wonderful, charming score. Bart's lyrics are particularly infectious and clever, and I'd embedded the lively title song, whose music is by Laurie Johnson. But there's one particular song that's not just my favorite in the show, but in that list of "favorites, period."
It requires a bit of an explanation. The song is the final number and sung by Mrs. Squeezum, played by a wonderful musical-comedy star, Hy Hazell, who I mentioned previously as having been in the musical Charlie Girl. (The closest that I can come to describing Hy Hazell is that she was like a British Ethel Merman -- a whirlwind dynamo who wouldn't be the romantic lead, but bowl you over with her strength and comedy.)
It's Lionel Bart's lyrics at their best, which is saying a lot. And Laurie Johnson's music at his most infectious.