All Soul's Day purposely follows All Saints' Day to shift the focus from those in heaven to those in purgatory.
Before the Reformation, poor Christians used to offer prayers for the dead in return for money or even food (Soul Cakes) from wealthier people.
Traces of this tradition can be seen in the 19th and 20th centuries when children used to go 'souling' that is, they used to go around the houses singing the song which follows here below and then requesting alms or souls cakes. Each cake eaten represented a soul freed from purgatory.
A Soul, a soul, a soul cake
Please good missus a soul cake
An apple, a pear, a plum or a cherry
Any good thing to make us merry
Up with your kettles and down with your your pans
Give us an answer and we'll be gone
Little Jack, Jack sat on his gate
Crying for butter to butter his cake
One for St Peter, two for St Paul,
three for the man who made us all!
Old Folk Chant,
[ PS: enjoy Sting singing 'Soul Cake' on youtube ]