Answer:
I am merry creature in pleasant time of year as in but certain seasons I sing that you can hear; And yet I'm made a by-word A very perfect mock; Compared to foolish persons And silliest of all folk.
Iβm hard as a rock and as light as a feather. Iβm passed on to one another. Poor people need me and rich people have me.
What starts with an 'e' and ends with an 'e' but only has one letter?
I am bought by the yard but worn by the foot. What am I?
I go inside boots and outside shoes.
I flow from the Homerβs mouth when he sees doughnuts.