A short Shrove Tuesday rhyme built around tossing something into the air on each line, originally a pancake, here a ball. It plays as much as it's spoken, and the opening 'Great A, little a' doubles as an early letter game.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Great A, little a,
This is pancake day;
Toss the ball high,
Throw the ball low,
Those that come after
May sing heigh-ho!
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition