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| Written by | Joe Raposo |
| Date | 1971 |
| Publisher | Green Fox Music, Inc. |
"Lullaby" is, appropriately, a lullaby performed on Sesame Street in Episode 0318.
Throughout the episode, Big Bird has trouble trying to stay awake, having fallen asleep multiple times already. Susan and David assist him in taking a nap in the yard by supplying him a blanket and singing softly to him, which helps him finally settle down for a long nap.
Maria sings an abridged Spanish version of the song in Episode 0349.