No, this will not be a discussion about running around on your spouse, lover or significant other, and it has nothing to do with a Beach Boy's song from the sixties. This will be a brief discussion of several French forms of poetry that have been translated into English. Much like the villanelle, all of these forms utilize a limited rhyme scheme and feature refrains.
Rondeau
The rondeau, or rondeaux in plural form has two basic restraints from which the poem is built. The first of these is a refrain made up of the first word or words in the first line which must appear in line nine and fifteen of the fifteen line poem. The second restraint is that the remaining non-refrain lines utilize only two rhymes. The thirteen lines also must be written in the same meter, often either in iambic lines of four or five feet.
Sometimes the first five lines form the first stanza, sometimes there is no break until after the ninth line. The following rhyming diagrams will show the layout of the rondeau:
Line refrain or rhyme
1      R a   —first line contains refrain
2 Â Â Â Â Â a
3 Â Â Â Â Â b
4 Â Â Â Â Â b
5 Â Â Â Â Â a
6 Â Â Â Â Â a
7 Â Â Â Â Â a
8 Â Â Â Â Â b
9 Â Â Â Â Â R -- refrain
10Â Â Â Â Â a
11Â Â Â Â Â a
12Â Â Â Â Â b
13Â Â Â Â Â b
14Â Â Â Â Â a
15Â Â Â Â Â R -- refrain
Or alternately
Line refrain or rhyme
1      R a   —first line contains refrain
2 Â Â Â Â Â a
3 Â Â Â Â Â b
4 Â Â Â Â Â b
5 Â Â Â Â Â a
6 Â Â Â Â Â a
7 Â Â Â Â Â a
8 Â Â Â Â Â b
9 Â Â Â Â Â R -- refrain
10Â Â Â Â Â a
11Â Â Â Â Â a
12Â Â Â Â Â b
13Â Â Â Â Â b
14Â Â Â Â Â a
15     R – refrain
One of the challenges of a rondeau is the effective use of only two different rhymes. The poems often have a forced or artificial feel unless the rhyme is handled with deft subtlety.
Roundel
A roundel is very similar to the rondeau except with fewer lines and slightly rearranged refrains. The roundel should have lines of any single length, not necessarily with matching meter. This eleven line poetic form draws the refrain from the first word or words of the first line. The refrain is repeated in line four and eleven, with the stanza breaks after the fourth and seventh line. Again like the rondeau, the non-refrain lines use only two rhymes. The roundel would diagram as follows:
Line refrain or rhyme
1      R a   '—first line contains refrain
2 Â Â Â Â Â b
3 Â Â Â Â Â a
4      R – refrain
5 Â Â Â Â Â b