What is the Roud Folk Song Index number of the lullaby Effie Crockett wrote  in 1872?
Effie Crockett:  She is credited with having written and composed the lullaby "Rock-a-bye Baby"; by some accounts she created the song in 1872 while babysitting. Rock-a-bye Baby:  It has a Roud Folk Song Index number of 2768.
2768