You can play or download this song at The Internet Archive. It's song #6 on that page. Here's my transcription:

LITTLE DRUMMER BOY
Words and music by Art Noel and Don Pelosi, ©1938.
As sung by Gracie Fields

1. The day is ended, little drummer boy.
Lights out was sounded long ago,
So close your eyes, my little drummer boy,
And dream of the ones that love you so.
Reveille will sound in the morning.
Once more on parade you will go,
So close your eyes, my little drummer boy,
And say goodnight to all your friends and foes.

2. Little drummer boy, you're all the world to me,
Dressed up in your little soldier's clothes.
Little drummer boy, just climb upon my knee,
And rest your curly head in sweet repose.

REPEAT 1