Very quietly, because the blind hasn't been raised yet, Charlie is singing:

"The birdies, the bird is the word ... sweetie bird ... the bird is a boy, sweetie boy ... bird is a sweetie girl ... the bird, the bird, the bird is the word ... sweetie pie bird ... Charlie is a sweetie pie boy ... oh, oh, oh, sweetie pie bird ..."

Much in contrast with knocking that wooden egg against the cage grate during the night, which has all the charm of a cat with a marble at 3:30 a.m.

He created that little "oh, oh, oh" all by himself.