Sub-contrabass Bassoon Part II: C is D's A-flat

At the left side of the pages
Every single line of key signatures doesn't look like mine
The motto is just a lie
It says "Do is B-flat"
But what a shame
'Cause everyone's B-flat isn't the same
Only beats keep us in line
C is D is F
At the end of another long slur
D.S. signs leading somewhere:
C is D's A-flat
Accidentals with scrawled crossouts
No one really seems to play
I read the carvings on the music stand
Some kid from decades ago hated band
And they seemed to confess they didn't play much
But it only confirmed that
The left side of the page puts me in rage
And I could care less.