The Rattlin' Bog is a popular Irish folk song about a bog

Bog

A bog, quagmire or mire is a wetland that accumulates acidic peat, a deposit of dead plant material—often mosses or, in Arctic climates, lichens....

 in a valley, and the contents of it. The song is a cumulative song

Cumulative song

A cumulative song is a song whose verses are built from earlier verses, usually by adding a new stanza to the previous verse. A simple cumulative song having n verses is structured as-Examples of cumulative songs:* "The Twelve Days of Christmas"...

, similar to The Twelve Days of Christmas

The Twelve Days of Christmas (song)

"The Twelve Days of Christmas" is an English Christmas carol that enumerates a series of increasingly grand gifts given on each of the twelve days of Christmas. Although first published in England in 1780, textual evidence may indicate the song is French in origin...

, 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.

Lyrics

(Chorus:)

Hi ho, the rattlin' bog,

The bog down in the valley-o,

Hi ho, the rattlin' bog,

The bog down in the valley-o.

Now in the bog there was a tree,

A rare tree, a rattlin' tree;

The tree in the bog,

And the bog down in the valley-o.

(Chorus)

And on that tree there was a branch,

A rare branch, a rattlin' branch,

The branch on the tree,

And the tree in the bog,

And the bog down in the valley-o.

(Chorus)

The verses continue in a like manner, with increasing details of the tree and its contents, such as:

Now on that branch there was a twig...

Now on that twig there was a leaf...

Now on that leaf there was a nest...

Now in that nest there was an egg...

Now in that egg there was a bird...

Now on that bird there was a wing...

Now on that wing there was a feather...

Now on that feather there was a flea...

Now on that flea there was a rash...

Performing

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

The Idlers

The Idlers of the United States Coast Guard Academy are an all-male collegiate a cappella ensemble specializing in the performance of sea shanties and patriotic music.-Overview:...

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.