The Rattlin' Bog is a popular Irish folk song about a bog in a valley, and the contents of it. The song is a cumulative song, similar to The Twelve Days of Christmas, as it has a list at the end of each verse which grows throughout the piece. In some performances of the song, the speed is constantly increased, in the same way that the Sailor's Hornpipe is sometimes played.
The verses continue in a like manner, with increasing details of the tree and its contents, such as:[2]
or
During a performance, it is typical for the song to increase in speed with each additional verse, almost as a challenge to determine who can sing the lyrics the fastest without getting mixed up.
Some performances have one singer leading the song, singing the Now on that... lines solo. The whole group then joins in for the cumulative list and chorus. In some live performances, the audience sings along for as long as they can keep up, with most only skilled still singing the chorus by the end of the song.
Many variations exist where additional verses are added or exchanged to suit the locale where the song is performed. North American folk group The Idlers customarily sing about a bird inside an egg inside another bird that is in the nest, while others have a bird in the egg in the nest. Additionally, the group added a rash on the flea as a final verse.
The song can be sung as an echo, where each line is sung by a lead and then repeated by others.