Saturday is the only day of the week not mentioned in the Beatles song “Lady Madonna.” According to the book Paul McCartney: Many Years From Now by Barry Miles, Paul McCartney recalled, “I was writing the words out to learn it for an American TV show and I realized I missed out Saturday; I did every other day of the week, but I missed out Saturday. So I figured it must have been a real night out.”
The lyrics that mention the other six days are:
Friday night arrives without a suitcase.
Sunday morning creeping like a nun.
Monday’s child has learned to tie his bootlace, see how they run…
Tuesday afternoon is never ending.
Wednesday morning papers didn’t come.
Thursday night your stockings needed mending, see how they run…
“Lady Madonna” was released as a single in March 1968. It was written by Paul McCartney with a minor contribution from John Lennon (credited to Lennon/McCartney).