"Ten Green Bottles" is a traditional counting song for children. The song is similar to Ten in the Bed. It starts with ten green bottles, with the number steadily reducing until there are "no green bottles hanging on the well". The sheet music for this song, or the equivalent midi or mp3 files 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 Ten Green Bottles for piano in PDF format.