The first song on Natalie Merchant's album Leave Your Sleep is Nursery Rhyme of Innocence and Experience, by Charles Causley, a title evocative of William Blake's Songs of Innocence and of Experience. I'm abashed that this song is my introduction to Causley's poetry. I don't know how to write about poetry in a way that isn't choked with cliches. I'd rather just read it, think about it, and appreciate it anew when it's set to music. However, if I had to choose one word to describe Causley's poetry, it would be the German sehnzucht, which roughly translates to yearning and longing. Here is a video of Merchant performing "Nursery Rhyme of Innocence and Experience."
This essay by Dana Gioia mentions Walter de la Mare as an influence. Yes. Causleys' work immediately reminded me of Mare's work, whose poems appear at first as if they are meant for children, but resonate with adults as well.