Where do you start? Marie Lloyd - but check this thread.
And then "If it Wasn't for the 'Ouses In Between" has a nice ring to it.
Cosmotheka used to do a song "You Can't Get Many Pimples on a Pound of Pickled Pork" - in fact Al Sealey still does talks on Music Hall, particularly Stanley Holloway, peppered with songs.

And this is a good schpiel on Music Hall songs.

I'm sure there will be a lot of "favourites" quoted soon.