Not banal or childish at all, Tsuwm mon chou.

Sing-songs are phenomenal memory aids and tend to stay with you long past the time when monotone sentences, uttered by stoic teachers, have long been forgotten.

Take "interjections" as an example. No matter how old I get, the Schoolhouse-Rock song about interjections will always twitter through my head to remind me that

"Interjections, show excitement,
or emotion,
They're sometimes set apart from a sentence
by an exclamation point,
Or by a comma when the feeling's not as strong."