It's amazing that I learned this song in grade school about 75 years ago and it's happy tune and message still resonate. We raised a small flock of sheep years ago and our first three ewes were named Rosie, Betsy, and Molly. These are the words as I remember them:

Rosie, Betsy, Blue eyed Molly, Molly,
Come and join the April folly folly,
Who can stay at home all day
While Jenny Wren is building in the willow.

Put on your primrose colored gown,
Run in your green shoes out of town,
Put on your primrose colored gown,
While Jenny Wren is building in the willow.