From Piano Lessons - Billy Collins

He says the scale is the mother of the chords.
I can see her pacing the bedroom floor
waiting for her children to come home.
They are out at nightclubs shading and lighting
all the songs while couples dance slowly
or stare at one another across tables.
This is the way it must be. After all,
just the right chord can bring you to tears
but no one listens to the scales,
no one listens to their mother.