As someone who walks about humming or even singing without knowing, this looks fascinating.Most of my poems have music but I don’t write it down.
https://www.bl.uk/romantics-and-victorians/articles/the-music-of-william-blakes-poetry
Where else in the Songs are there references to music and singing?
The first song in the Songs of Innocence sets a number of themes that recur during the collection: the child, nature, and song. It is the child that tells the poet to pipe, but then to sing; and then leaves the singer alone to write the poems.
What happens in the poem is that the poet pipes, then is asked to sing, and then sing again, and then to transcribe what has been sung. Thus there is a clear indication that these are songs for both reading and singing. At the end of ‘Introduction’ this is reiterated, as the songs are to be heard:
And I wrote my happy songs
Every child may joy to hear
The last line of the introductory poem to Songs of Innocence makes it clear that the songs were to be written down ‘so that every child may hear’.
How my heart sings 