"Little Jack Horner" is a traditional Nursery Rhyme for children. It is one of those songs where actions can be added to make it more memorable, and to teach young children where their thumb is: first pointing it down and then pointing the thumb up. There are certain similarities among the the melodies for "Little Jack Horner", Ride a Cock Horse, Rub-a-Dub-Dub. PDF sheet music, Midi and Mp3 files for this melody can be downloaded using the links in the left-hand menu.
The image below is the first page of the sheet music, and here you can download the full sheet music for Little Jack Horner for piano in PDF format.