This refers to street cries of itinerant merchants selling their goods or wares on the street.

At first I couldn't think of a way to put this in English, probably because it's rarely talked about anymore in English-speaking countries, but I found this reference in the Wikipedia entry for "street cries":

The 19th century social commentator, Henry Mayhew describes a Saturday night in the New Cut, a street in Lambeth, south of the river;
"Lit by a host of lights… the Cut was packed from wall to wall… The hubbub was deafening, the traders all crying their wares with the full force of their lungs against the background din of a horde of street musicians".
https://en.wikipedia.org/wiki/Street_cries

There may be a better way of putting it, but I can't think of one right now.

By the way, it's still common here in Mexico to see or hear street hawkers, particularly tamale sellers (tamaleros) in the evening on tricycles with this famous recording playing "...pida sus ricos y deliciosos tamales oaxaqueños, hay tamales oaxaqueños, tamales calientitos..." or others, such as pastry sellers (paneros) and people selling gas, water, or other services.