"I Had a Little Nut Tree" is a traditional Nursery Rhyme and Song. It tells a strange story about a fruit tree and a princess, although there are differences in the words and number of verses among different versions. However the same melody seems to be used for all versions. The sheet music, Midi and Mp3 files for this song 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 I Had a Little Nut Tree for piano in PDF format.