It's years since I sang this but i think the chords I used were:

[C] History lesson, it's time to re-[G7]-member
[C] Time to remember the deeds of the [G7] great
[F] Please pay attention, don't let you mind [C] wander
[C] Daydreams and playtime can [G7] wait
[Bb] Black the [C] minnows that [G7] swarm in the [C] water
[C] White, the butterfly flits in the [G7] sun
[Bb] Red, the [C] blossom, and [G7] pink the mag-[C]-nolia
[C] History Lesson's be-[G7]-gun...

E is a bit high for me though many might prefer to transpose into D which is just as good. I think Rosselson's genius is to use the modulation to grab your attention when the "colour" section starts.