"Frere Jacques" is a traditional French nursery rhyme, and this is the Round version of the Song since it is frequently sung in this way. One child or group will start singing the melody, and then a second child or group will join in 2 bars later, and so on. If there are sufficent children or groups then four separate parts can continue to sing the round, each unit starting again at the beginning of the song after they have reached the end. The PDF sheet music, Midi and Mp3 files for this roundy can be downloaded using the links in the left-hand menu.
The standard (non-Round) version of the song is available at this link: Frere Jacques.