It's actually Mozart's 40th, and in the grand oral tradition has many variants. I learned it as ...let him out, let him out, let him out rather than "get."

Such doggerel was intended to be helpful reminders, not impositions.

There's probably a whole new thread here: jingles meant to cue musical themes and composers, like

-- Italian, Italian by Mendelssohn

-- This . is . . the sym.phony . . that Schu.bert wrote and never

-- The Blue Danube Waltz . by Strauss . the louse .

Any others singing out there?