A little known fact is that William Blake was a talented musician who would sing his poems. Unfortunately no sheet music of his poems exist, meaning the actual melodies he specifically used are unknown. But musicians have adapted Blake's poetry into song, and through that we can get glimpses of the music of Blake's poetry.
I'm interested in Sherri Poterfield's adaptation of William Blake's The Tiger. I found a really nice recording of a performance of Poterfield's piece on YouTube; listening to the video will give a better sense of the piece than reading the lyrics.
One of the things that interests me is that while the very first line of Blake's text is:
Tiger tiger burning bright
Poterfield made the decision to begin with:
Tiger tiger burning brightly
What is the reason for that change?