Really, Jim? We know the songs came from a wide variety of sources, mostly straight from the urban ballad writers but many first appeared in the theatre, pleasure gardens, supper rooms, music cellars, glee clubs, Music Hall, sheet music, songsters, etc., all commercial, in other words somebody was getting paid for their production, albeit only a shilling a go in the case of the broadside writers. The further you go back the more actually originated in London, for obvious reasons. Your 'Blind Beggar' for instance.