It is not what they built. It is what they knocked down. It is not the houses. It is the spaces between the houses. It is not the streets that exist.… - James Fenton

It normally happens that if you put two words together, or two syllables together, one of them will attract more weight, more emphasis, than the other. In other words, most so-called spondees can be read as either iambs or trochees.

Poetry carries its history within it, and it is oral in its origins, its transmission was oral.

Tennyson follows his feelings in creating each line. He follows the music in his head. If you had asked him, at the end of the day, to describe the prosody of the poem to you, he would no doubt have had to think for a moment before he could answer you, not because he was ignorant of the terms, but because he had been writing a poem, not a metrical exercise. At every point, he was exerting his free will. And the outcome of that exertion was the form.