Wagner made some lush compositions set to her poems. The were friends, apparently. My guess is that they were friends and lovers.
Anyway, Wesendonck Lieder. Full of language that can also be found in Schoenberg's "Transfigured Night" op. 4. Full of mystery. Raw and biting, yet sensual.
Music, sculptor of ages and dance, mending and breaking hearts. Mistress and mother.
It stands me up straight in the morning and sees me off to sleep at night.