I think you are thinking of the old standard "Sunday", by Jule Styne, rather than a folk song. Hope this helps.I'm blue every Monday thinking over Sunday
That one day when I'm with you.
It seems that I sigh all day Tuesday
and I cry all day Wednesday.
Oh, my, how I long for you.And then comes Thursday
Gee, it's long, it never goes by.
Friday makes me feel like I'm gonna die.But after payday is my fun day,
I shine all day Sunday
That one day when I'm with you.