Were all of Shakespeare's plays fully in iambic pentameter?

Question

Were the plays within The Complete Works of Shakespeare entirely in iambic pentameter? I seem to recall singing bits (when there were lyrics) from Twelfth Night and definitely from Much Ado About Nothing, which were not in that metric form. However, it could be the way that I had strung the lyrics together so that I could stress the rhyming words - unlike the lines I spoke. **Are Shakespeare's plays completely in iambic pentameter?**

Answer 1

No, it wasn't your singing, his plays were not strictly in iambic pentameter.