"Rock-a-bye Baby" or "Hush-a-bye Baby" is a traditional Nursery Rhyme for children. It is a gentle soothing song intending to keep a baby calm and relaxed so it will fall asleep - in other words a Lullaby. There are different variants to the song, including variations in the words and two widely known melodies. We've called this one "Tune B" and it seems to be better known in North America, while Tune A seems to be better known in the UK. PDF sheet music, Midi and Mp3 files for this melody can be downloaded using the links in the left-hand menu.