These lines are two of the most famous in all of Shakespeare's works. Interestingly, the chants of the Weird Sisters are not written in Shakespeare's primary meter, iambic pentameter, but in a rapid meter called trochaic tetrameter. Most of Shakespeare's enchanted verse is written in trochaic tetrameter.
How to cite this article:
Mabillard, Amanda. Macbeth Glossary. Shakespeare Online. 20 Aug. 2000. (date when you accessed the information) < http://www.shakespeare-online.com/plays/macbeth/macbethglossary/macbeth1_1/macbethglos_doubledouble.html >.