Undersong of the rainforest

I have just read that there is a word, under song, which describes the sound of a landscape or the murmur of an environment often hard to hear or tune in to.
I found undersong easily in the Amazon Rainforest. Lying neck deep in a cool stream on a hot, humid day with my eyes shut I could hear the rainforest around me ..helped by the rhymic pulsing of insect chirps…the forest seemed to speak to me. In the soft movement of leaves and the cathedral like canopy of trees it spoke to me of strength and vulnerability.