Make a wish, on dandelion wings,
Watching  it whirl, hoping it brings
What your heart does desire;
Make a wish, when a songbird sings,
Of simple joys and happy things,
And peace that does inspire.

Sestets are six line poetry forms. In his "Book of Forms", Lewis Turco lists over a dozen variations of six line poetry forms. Several of them are well known to Sonnet writers and are considered by most simply to be a turn or shift in argument.

Very few poets today think of these forms as a poetry form in itself. One example that comes readily to mind is Theodore Roethke's Open House.

The Welsh and Irish have several examples of six line poetry as aficionados will quickly attest and there are also several Oriental versions that can be added to the list. Again most poets do not consider these forms when writing.

There are many forms and a few are given below:

Burns Stanza a. a. a. b. a. b. in iambic tetrameter or triameter; 

English sestet - a. b. a. b. c. c. originally with no set meter, later in iambic pentameter

Italian sestet - a. b. c. a. b. c. originally with no set meter, later in iambic pentameter

Rima Couee - a. a. b. a. a. b. where a has eight syllables and b is of six syllables 

Stave Sestet - a. a. b. b. C1. C2 - where C1 is the repeat word and C2 is the repeated line.