https://youtu.be/8ErWLOD_udY?t=2429
(Crystal, of course, being the linguist who worked on the reconstruction of Shakespeare's pronunciation, and consulted The Globe on it)
Take William Blake's The Tyger:
Tyger Tyger, burning bright,
In the forests of the night;
What immortal hand or eye,
Could frame thy fearful symmetry?
How are we to know how the word "symmetry" was supposed to be pronounced by Blake? No-one has recorded his pronunciation. Did it rhyme with the word "eye" (as such words must have done several centuries prior) or was it a completely "eye-rhyme" (and not very good at that, either), intended to be seen as a rhyme, but not pronounced as such?Professional students of linguistics will say that the terminal -y was pronounced as "eye" in the time of Shakespeare; but by the time of Blake such pronunciation has already become obsolete. However, this doesn't help us distinguish between two possibilities:
- Blake's -y rhyme is purely visual and is no more than a nod to the tradition; it is not intended to be pronounced as /ai/, or
- Poems of that time used to be delivered in an archaic pronunciation, in which case "symmetry" actually rhymed with "eye".
I don't think linguists have an answer that would convincingly point to either of the two possible pronunciations.
To my ear as an English person, it sounds like a Westcountry accent, an example of an English accent which is still rhotic today. But other people might perceive it as being slightly American or Irish sounding.