The Perry novel is, of course, set in Victorian London, and contains some mentions of music halls. The music hall song I know best is "My Old Man Said Follow the Van," so here it is, with some other classic London songs. This performance is from 1961 and quite stagey, but it's fun.
I have another song for you! This is a library-themed song, and I can't get it to embed, but the lyrics are at the page anyway. Please enjoy "What Can I Help You Find Today?" -- it's funny!